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Aspen Aerogels Inc. – ‘10-K’ for 12/31/23 – ‘EX-101.SCH’

On:  Thursday, 3/7/24, at 5:03pm ET   ·   For:  12/31/23   ·   Accession #:  950170-24-28127   ·   File #:  1-36481

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 3/07/24  Aspen Aerogels Inc.               10-K       12/31/23   94:13M                                    Donnelley … Solutions/FA

Annual Report   —   Form 10-K   —   SEA’34

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   3.85M 
 2: EX-3.2      Articles of Incorporation/Organization or Bylaws    HTML    173K 
 3: EX-14.1     Code of Ethics                                      HTML    484K 
 4: EX-21.1     Subsidiaries List                                   HTML     26K 
 5: EX-23.1     Consent of Expert or Counsel                        HTML     26K 
 9: EX-97       Clawback Policy re: Recovery of Erroneously         HTML    107K 
                Awarded Compensation                                             
 6: EX-31.1     Certification -- §302 - SOA'02                      HTML     31K 
 7: EX-31.2     Certification -- §302 - SOA'02                      HTML     31K 
 8: EX-32       Certification -- §906 - SOA'02                      HTML     29K 
11: R1          Document and Entity Information                     HTML    100K 
12: R2          Consolidated Balance Sheets                         HTML    119K 
13: R3          Consolidated Balance Sheets (Parenthetical)         HTML     49K 
14: R4          Consolidated Statements of Operations               HTML    100K 
15: R5          Consolidated Statements of Stockholders' Equity     HTML    105K 
16: R6          Consolidated Statements of Stockholders' Equity     HTML     39K 
                (Parenthetical)                                                  
17: R7          Consolidated Statements of Cash Flows               HTML    145K 
18: R8          Consolidated Statements of Cash Flows               HTML     28K 
                (Parenthetical)                                                  
19: R9          Pay vs Performance Disclosure                       HTML     39K 
20: R10         Insider Trading Arrangements                        HTML     37K 
21: R11         Description of Business                             HTML     41K 
22: R12         Summary of Basis of Presentation and Significant    HTML     78K 
                Accounting Policies                                              
23: R13         Revenue from Contracts with Customers               HTML    202K 
24: R14         Inventories                                         HTML     42K 
25: R15         Property, Plant and Equipment, Net                  HTML     62K 
26: R16         Accrued Expenses                                    HTML     40K 
27: R17         Revolving Line of Credit                            HTML     30K 
28: R18         Related Party Transactions                          HTML     41K 
29: R19         Convertible Note - Related Party                    HTML     67K 
30: R20         Other Income (Expense)                              HTML     34K 
31: R21         Leases                                              HTML     52K 
32: R22         Commitments and Contingencies                       HTML     52K 
33: R23         Stockholders' Equity                                HTML     34K 
34: R24         Employee Benefit Plan                               HTML     31K 
35: R25         Employee Stock Ownership Plans                      HTML    174K 
36: R26         CARES Act Payroll Tax Deferral                      HTML     31K 
37: R27         Net Loss Per Share                                  HTML     74K 
38: R28         Income Taxes                                        HTML    113K 
39: R29         Segment Information                                 HTML    142K 
40: R30         Subsequent Events                                   HTML     33K 
41: R31         Valuation and Qualifying Accounts                   HTML     68K 
42: R32         Description of Business (Policies)                  HTML    149K 
43: R33         Revenue from Contracts with Customers (Tables)      HTML    188K 
44: R34         Inventories (Tables)                                HTML     43K 
45: R35         Property, Plant and Equipment, Net (Tables)         HTML     57K 
46: R36         Accrued Expenses (Tables)                           HTML     39K 
47: R37         Convertible Note - Related Party (Tables)           HTML     48K 
48: R38         Leases (Tables)                                     HTML     43K 
49: R39         Commitments and Contingencies (Tables)              HTML     43K 
50: R40         Employee Stock Ownership Plans (Tables)             HTML    148K 
51: R41         Net Loss Per Share (Tables)                         HTML     75K 
52: R42         Income Taxes (Tables)                               HTML    103K 
53: R43         Segment Information (Tables)                        HTML    140K 
54: R44         Description of Business - Additional Information    HTML     86K 
                (Detail)                                                         
55: R45         Summary of Basis of Presentation and Significant    HTML     87K 
                Accounting Policies - Additional Information                     
                (Detail)                                                         
56: R46         Revenue from Contracts with Customers - Additional  HTML     42K 
                Information (Details)                                            
57: R47         Revenue from Contracts with Customers - Summary of  HTML     56K 
                Revenue Disaggregated by Geographical Region and                 
                Source of Revenue (Detail)                                       
58: R48         Revenue from Contracts with Customers - Summary of  HTML     46K 
                Changes in Contract Assets and Contract                          
                Liabilities (Detail)                                             
59: R49         Inventories - Schedule of Inventories (Detail)      HTML     36K 
60: R50         Property, Plant and Equipment, Net - Summary of     HTML     55K 
                Property, Plant and Equipment (Detail)                           
61: R51         Property, Plant and Equipment, Net - Additional     HTML     43K 
                Information (Detail)                                             
62: R52         Accrued Expenses - Schedule of Accrued Expenses     HTML     33K 
                (Detail)                                                         
63: R53         Revolving Line of Credit - Additional Information   HTML     37K 
                (Detail)                                                         
64: R54         Related Party Transactions - Additional             HTML     79K 
                Information (Details)                                            
65: R55         Convertible Note - Related Party - Additional       HTML    103K 
                Information (Detail)                                             
66: R56         Convertible Note - Related Party - Summary of       HTML     36K 
                Convertible Notes (Detail)                                       
67: R57         Other Income (Expense) - Additional Information     HTML     48K 
                (Detail)                                                         
68: R58         Leases - Additional Information (Detail)            HTML     65K 
69: R59         Leases - Summary of Maturities of Operating Lease   HTML     45K 
                Liabilities (Detail)                                             
70: R60         Commitments and Contingencies - Additional          HTML     73K 
                Information (Detail)                                             
71: R61         Commitments and Contingencies - Summary of          HTML     34K 
                Capitalized Implementation Costs are Classified on               
                the Consolidated Balance Sheets (Detail)                         
72: R62         Stockholders' Equity - Additional Information       HTML     32K 
                (Detail)                                                         
73: R63         Employee Benefit Plan - Additional Information      HTML     29K 
                (Detail)                                                         
74: R64         Employee Stock Ownership Plans - Additional         HTML    142K 
                Information (Detail)                                             
75: R65         Employee Stock Ownership Plans - Summary of Stock   HTML     39K 
                Based Compensation Included in Cost of Sales or                  
                Operating Expenses (Detail)                                      
76: R66         Employee Stock Ownership Plans - Summary of Fair    HTML     45K 
                Value of Option Awards Estimated by Use of                       
                Black-Scholes Option Pricing Model (Detail)                      
77: R67         Employee Stock Ownership Plans - Summary of Stock   HTML     96K 
                Option Outstanding (Detail)                                      
78: R68         Employee Stock Ownership Plans - Summary of         HTML     57K 
                Grants, Vesting, and Forfeitures of RSUs (Detail)                
79: R69         CARES Act Payroll Tax Deferral - Additional         HTML     37K 
                Information (Details)                                            
80: R70         Net Loss Per Share - Computation of Basic and       HTML     58K 
                Diluted Net Loss Per Share (Detail)                              
81: R71         Net Loss Per Share - Summary of Potentially         HTML     40K 
                Dilutive Common Shares Excluded from Computation                 
                of Diluted Net Loss Per Share (Detail)                           
82: R72         Income Taxes - Schedule of Reconciliation Between   HTML     49K 
                U.S. Statutory Income Tax Rate and Company's                     
                Effective Rate (Detail)                                          
83: R73         Income Taxes - Schedule of Deferred Tax Assets and  HTML     57K 
                Deferred Tax Liabilities (Detail)                                
84: R74         Income Taxes - Additional Information (Detail)      HTML     57K 
85: R75         Segment Information - Additional Information        HTML     28K 
                (Detail)                                                         
86: R76         Segment Information - Summary of Revenue and        HTML     84K 
                Segment Operating Profit (Detail)                                
87: R77         Segment Information - Schedule of Revenues, Based   HTML     36K 
                on Shipment Destination or Research Services                     
                Location (Detail)                                                
88: R78         Subsequent Events - Additional Information          HTML     43K 
                (Detail)                                                         
89: R79         Schedule II - Valuation and Qualifying Accounts     HTML     41K 
                (Detail)                                                         
91: XML         IDEA XML File -- Filing Summary                      XML    174K 
94: XML         XBRL Instance -- aspn-20231231_htm                   XML   2.69M 
90: EXCEL       IDEA Workbook of Financial Report Info              XLSX    183K 
10: EX-101.SCH  XBRL Taxonomy Extension Schema With Embedded         XSD   4.16M 
                Linkbases Document -- aspn-20231231                              
92: JSON        XBRL Instance as JSON Data -- MetaLinks              586±   912K 
93: ZIP         XBRL Zipped Folder -- 0000950170-24-028127-xbrl      Zip    745K 


‘EX-101.SCH’   —   XBRL Taxonomy Extension Schema With Embedded Linkbases Document — aspn-20231231


This Exhibit is an XBRL File.


                                                                                                                                                                                
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfOperations" xlink:href="aspn-20231231.xsd#Role_StatementConsolidatedStatementsOfOperations" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows" xlink:href="aspn-20231231.xsd#Role_StatementConsolidatedStatementsOfCashFlows" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentNetSummaryOfPropertyPlantAndEquipmentDetail" xlink:href="aspn-20231231.xsd#Role_DisclosurePropertyPlantAndEquipmentNetSummaryOfPropertyPlantAndEquipmentDetail" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/DisclosureConvertibleNoteRelatedPartySummaryOfConvertibleNotesDetail" xlink:href="aspn-20231231.xsd#DisclosureConvertibleNoteRelatedPartySummaryOfConvertibleNotesDetail" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevenueFromContractsWithCustomersSummaryOfChangesInContractAssetsAndContractLiabilitiesDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureRevenueFromContractsWithCustomersSummaryOfChangesInContractAssetsAndContractLiabilitiesDetail" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevolvingLineOfCreditAdditionalInformationDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureRevolvingLineOfCreditAdditionalInformationDetail" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/DisclosureSegmentInformationScheduleOfRevenuesBasedOnShipmentDestinationOrResearchServicesLocationDetail" xlink:href="aspn-20231231.xsd#DisclosureSegmentInformationScheduleOfRevenuesBasedOnShipmentDestinationOrResearchServicesLocationDetail" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureCARESActPayrollTaxDeferral" xlink:href="aspn-20231231.xsd#Role_DisclosureCARESActPayrollTaxDeferral" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureNetLossPerShare" xlink:href="aspn-20231231.xsd#Role_DisclosureNetLossPerShare" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureValuationAndQualifyingAccounts" xlink:href="aspn-20231231.xsd#Role_DisclosureValuationAndQualifyingAccounts" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureDescriptionOfBusinessPolicies" xlink:href="aspn-20231231.xsd#Role_DisclosureDescriptionOfBusinessPolicies" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosurePropertyPlantAndEquipmentNetTables" xlink:href="aspn-20231231.xsd#Role_DisclosurePropertyPlantAndEquipmentNetTables" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/DisclosureConvertibleNoteRelatedPartyTables" xlink:href="aspn-20231231.xsd#DisclosureConvertibleNoteRelatedPartyTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureLeasesTables" xlink:href="aspn-20231231.xsd#Role_DisclosureLeasesTables" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureEmployeeStockOwnershipPlansTables" xlink:href="aspn-20231231.xsd#Role_DisclosureEmployeeStockOwnershipPlansTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureCARESActPayrollTaxDeferralTables" xlink:href="aspn-20231231.xsd#Role_DisclosureCARESActPayrollTaxDeferralTables" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureNetLossPerShareTables" xlink:href="aspn-20231231.xsd#Role_DisclosureNetLossPerShareTables" xlink:type="simple"/>
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<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureStockholdersEquityAdditionalInformationDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureStockholdersEquityAdditionalInformationDetail" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureEmployeeBenefitPlanAdditionalInformationDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureEmployeeBenefitPlanAdditionalInformationDetail" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureEmployeeStockOwnershipPlansSummaryOfFairValueOfOptionAwardsEstimatedByUseOfBlackScholesOptionPricingModelDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureEmployeeStockOwnershipPlansSummaryOfFairValueOfOptionAwardsEstimatedByUseOfBlackScholesOptionPricingModelDetail" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureEmployeeStockOwnershipPlansSummaryOfStockOptionOutstandingDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureEmployeeStockOwnershipPlansSummaryOfStockOptionOutstandingDetail" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureCARESActPayrollTaxDeferralAdditionalInformationDetails" xlink:href="aspn-20231231.xsd#Role_DisclosureCARESActPayrollTaxDeferralAdditionalInformationDetails" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureNetLossPerShareComputationOfBasicAndDilutedNetLossPerShareDetail" xlink:href="aspn-20231231.xsd#Role_DisclosureNetLossPerShareComputationOfBasicAndDilutedNetLossPerShareDetail" xlink:type="simple"/>
<link:roleRef roleURI="http://www.aerogel.com/20231231/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetail" xlink:href="aspn-20231231.xsd#DisclosureSegmentInformationAdditionalInformationDetail" xlink:type="simple"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CustomerAMember" xlink:label="aspn_CustomerAMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember" xlink:label="srt_AsiaMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AuditorFirmId" xlink:label="dei_AuditorFirmId"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentTransitionReport" xlink:label="dei_DocumentTransitionReport"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_WoodRiverCapitalLLCMember" xlink:label="aspn_WoodRiverCapitalLLCMember"/>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2024 </link:label>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Collaborative Arrangement and Arrangement Other than Collaborative [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Transition Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Transition Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected volatility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Remaining Contractual Term, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_WoodRiverCapitalLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Wood River Capital, LLC. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_WoodRiverCapitalLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Wood River Capital L L C Member </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_WoodRiverCapitalLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Wood River Capital, LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of debt discount due to modification of convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization Of Debt Discount Due To Modification Of Convertible Note Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amortization of debt discount due to modification of convertible note related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeFromEmployeeRetentionCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income from Employee Retention Credits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeFromEmployeeRetentionCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income from Employee Retention Credits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeFromEmployeeRetentionCredits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income from employee retention credits. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments of Stock Issuance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fees and issuance costs from at-the-market offering </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RegulatoryAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Regulatory Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RegulatoryAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Regulatory Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Thermal barrier contracts. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Thermal Barrier Contracts [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierContractsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Thermal Barrier Contracts [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestOnConvertibleDebtNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest on convertible debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestOnConvertibleDebtNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest on Convertible Debt, Net of Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerAdvancesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Customer advances gross. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerAdvancesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer Advances Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerAdvancesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepayment liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Revenue recognition. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue Recognition [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue Recognition [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Geographical [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Geographical </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllOtherCorporateAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> All other corporate assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllOtherCorporateAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> All Other Corporate Assets [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based award vesting period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Costs recorded as a component of construction in progress </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost of Revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cost of Revenue, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Segment Reporting Information, by Segment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Segment Reporting Information By Segment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Prepaid Expense and Other Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Prepaid expenses and other assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase (decrease) in operating lease liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase Decrease In Operating Lease Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Units (RSUs) [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock Units [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Restricted Common Stock Units [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSquareFeetForLease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of square feet for lease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSquareFeetForLease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Square Feet For Lease </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSquareFeetForLease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of square feet for lease </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Public Float </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Public Float </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cloud computing costs included in other current assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cloud Computing Costs Included In Other Current Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cloud computing costs included in other current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2027 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Four </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Sales return reserve. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sales Return Reserve </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sales return reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Useful Life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment, Useful life </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer, Excluding Assessed Tax </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IssuanceCostsFromUnderwrittenPublicOffering_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Issuance costs from underwritten public offering </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IssuanceCostsFromUnderwrittenPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Issuance Costs from Underwritten Public Offering </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IssuanceCostsFromUnderwrittenPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Issuance Costs from underwritten public offering. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_GeneralMotorsHoldingsLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> General Motors Holdings LLC. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_GeneralMotorsHoldingsLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> General Motors Holdings LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized compensation cost related to non-vested options grants </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net change in valuation allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Revenue Disaggregated by Geographical Region and Source of Revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration Risk Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Debt, Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> ICFR Auditor Attestation Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> ICFR Auditor Attestation Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income (Expense), Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Interest expense, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Interest Income (Expense), Net, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sales Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supply Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supply agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationRelatedCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Compensation Related Costs, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationRelatedCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based Compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnlimitedCarryForwardMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Unlimited carry forward. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnlimitedCarryForwardMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unlimited Carry Forward [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnlimitedCarryForwardMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unlimited Carryforward [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Title of Individual [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Title of Individual </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Events [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Subsequent Events </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtFairValueDisclosures_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt, Fair Value Disclosures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtFairValueDisclosures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible notes, fair value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OEMMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> OEM. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OEMMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> O E M [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OEMMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> OEM [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease liabilities long-term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Europe [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Europe [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transactions [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Balance Sheet Location [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Cash and Cash Equivalents [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities and Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total liabilities and stockholders' equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, State or Province </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, State or Province </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LineOfCreditFacilityIncreasedMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Line of credit facility increased maximum borrowing capacity. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LineOfCreditFacilityIncreasedMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line Of Credit Facility Increased Maximum Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LineOfCreditFacilityIncreasedMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Maximum increased borrowing amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Value, New Issues </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from offering, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Number of Shares, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Number of Shares, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Grant-date fair value of options granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted Average Grant Date Fair Value Per Share, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Common stock issuance offering expenses. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock Issuance Offering Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Offering expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award options expired in period intrinsic value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Expired In Period Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Trading Symbol </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Trading Symbol </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Shares, Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, shares issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Restricted common stock issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateFloorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Rate Floor [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateFloorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Floor Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prepaid Expense and Other Assets, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepaid expenses and other current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Compensation and Employee Benefit Plans [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Benefit Plan </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Interest Rate During Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revolving credit facility, interest rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss) Attributable to Parent [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Numerator: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractualInterestPaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Payment in-kind </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractualInterestPaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contractual Interest Payment In Kind </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractualInterestPaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contractual interest payment in kind. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InterestIncomeExpenseRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest expense, convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InterestIncomeExpenseRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income Expense Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InterestIncomeExpenseRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Interest income expense related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Selling and Marketing Expense [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sales and Marketing Expenses [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Shares, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending balance, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning balance, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2026 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Three </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Capital Shares Reserved for Future Issuance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shares reserved for issuance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commitments and contingencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments And Contingencies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments And Contingencies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Foreign Currency Transactions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Foreign Currency Transactions and Translations Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Property, Plant and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NatureOfBusinessPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Nature of business. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NatureOfBusinessPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Nature Of Business Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NatureOfBusinessPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Nature of Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, City or Town </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, City or Town </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transaction [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease, weighted average discount rate, percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalanceRemainingPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Remittance date of deferred tax balance, remaining percentage. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalanceRemainingPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Remittance Date Of Deferred Tax Balance Remaining Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalanceRemainingPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Remittance date of deferred tax balance, remaining percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Property, Plant and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amortization of cloud computing costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization Of Cloud Computing Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of cloud computing costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmortizationOfCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Amortization of cloud computing costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowancesForUncollectibleAccountsAndSalesReturnsAndAllowancesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Allowances For Uncollectible Accounts and Sales Returns and Allowances. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowancesForUncollectibleAccountsAndSalesReturnsAndAllowancesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Allowances For Uncollectible Accounts And Sales Returns And Allowances [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowancesForUncollectibleAccountsAndSalesReturnsAndAllowancesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allowances for Uncollectible Accounts and Sales Returns and Allowances [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Number of Shares, Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expiration of federal net operating loss carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Chief Executive Officer [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Chief Executive Officer [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Additional Paid-in Capital [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additional Paid-in Capital [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non-US [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLifeDescriptionOfTermExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of performance obligations. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Performance Obligations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of performance obligations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities, Current [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets, Current [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current assets: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Counterparty Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Counterparty Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, par value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankUkLimitedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Silicon Valley Bank UK Limited. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankUkLimitedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Silicon Valley Bank UK Limited [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Computer equipment and software. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Computer Equipment And Software [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Computer Equipment and Software [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lender Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lender Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Charges to (Deductions from) Other Accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increase in debt discount due to modification of convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInitiationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Initiation Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInitiationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior secured term loan, Draw beginning date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasicOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Basic, Other Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasicOtherDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Denominator: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Maturity Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Existing maturity date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Extended maturity date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeContractTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Contract [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Property, plant and equipment, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable, Credit Loss Expense (Reversal) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Provision for bad debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Charge for uncollectible accounts receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> U.S. federal income tax statutory rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LandlordMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Landlord. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LandlordMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Landlord [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LandlordMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Landlord [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Collaborative Arrangement and Arrangement Other than Collaborative [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesRecoveries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Addition, Recovery </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesRecoveries_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Recoveries of Costs and Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ValuationAndQualifyingAccountsDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ValuationAndQualifyingAccountsDisclosureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Valuation And Qualifying Accounts Disclosure [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Central Index Key </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Central Index Key </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Vesting of restricted stock units </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Plan Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award option aggregate fair value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Option Aggregate Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based awards granted to purchase common stock, grant date fair value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Liabilities Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CANADA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Canada [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Incentive Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Incentive Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Equity incentive plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Preferred Stock, Shares Outstanding, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Preferred Stock, Shares Outstanding, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TotalCapitalizedCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Total capitalized cloud computing costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TotalCapitalizedCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Total Capitalized Cloud Computing Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TotalCapitalizedCloudComputingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total capitalized cloud computing costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Conversion notes effective conversion price per share. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Conversion Notes Effective Conversion Price Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Conversion notes effective conversion price per share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total current liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Tax Identification Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Tax Identification Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income taxes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Finished Goods, Net of Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Finished goods </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Changes in operating assets and liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments of Debt Issuance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Issuance costs from convertible note </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance costs from convertible note </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line Of Credit Facility [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, maturity term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commissions and fees. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commissions And Fees </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commissions and fees </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Construction in Progress [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Construction in Progress [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Leases [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Common Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Restricted Common Stock Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Plan Name [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Plan Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Asset, after Allowance for Credit Loss [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Contract assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeInstrumentRiskAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Derivative Instrument [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LinesOfCreditCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LinesOfCreditCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Line of credit facility amount withdrawn </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Geographical [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Geographical </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Total assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Revenues, Based on Shipment Destination or Research Services Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasfMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> BASF. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasfMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Basf [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasfMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> BASF [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> UNITED STATES </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_US_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> U.S. [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Right-of-Use Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease right-of-use assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line of Credit Facility [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Changes in accrued capital expenditures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExpiredWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award options nonvested options expired weighted average grant date fair value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExpiredWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Options Expired Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExpiredWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value Per Share, Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Registrant Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Registrant Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Debt Issuance Costs, Net, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Issuance Costs, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Debt issuance costs, net of accumulated amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeaseDescriptionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Lease, Description [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party, Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retained Earnings (Accumulated Deficit) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated deficit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Retained Earnings (Accumulated Deficit), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supplemental Cash Flow Information [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supplemental disclosures of cash flow information: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SpringCreekCapitalLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Spring Creek Capital, LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SpringCreekCapitalLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Spring Creek Capital, LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaymentLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prepayment liability. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaymentLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prepayment Liability [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaymentLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Prepayment Liability [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentInKindPIKNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payment in Kind (PIK) Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentInKindPIKNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> PIK Interest [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Retained Earnings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accumulated Deficit [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterialsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Raw Materials, Net of Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterialsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Raw material </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Restricted Stock Units, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Restricted Stock Units, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccretionOfInterestOnConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accretion of interest on convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccretionOfInterestOnConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accretion Of Interest On Convertible Note Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccretionOfInterestOnConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Accretion of interest on convertible note related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EVThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> EV thermal barrier. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EVThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> E V Thermal Barrier [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EVThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> EV Thermal Barrier [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Minimum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Minimum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExtendedTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating lease extended term. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExtendedTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease Extended Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExtendedTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease extended term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Stock Options Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from employee stock option exercises </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Operating Lease, Liability, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-employee directors. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supply agreement expiration date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supply Agreement Expiration Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAgreementExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supply agreement termination date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Leasehold Improvements, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leasehold improvement costs capitalized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Component [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Component </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementBusinessSegmentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segments [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandFourteenEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Two thousand fourteen equity plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandFourteenEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Two Thousand Fourteen Equity Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandFourteenEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2014 Equity Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentCompanyCommittedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capital commitments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentCompanyCommittedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Investment Company, Committed Capital </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Repayments of Lines of Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Repayments of borrowings under line of credit, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average assumptions: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Adjustments to reconcile net loss to net cash used in operating activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additional interest rate per annum </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Current Reporting Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Current Reporting Status </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, shares authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Real Estate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RealEstateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Real estate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Research and Development Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Research and development </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Research and Development Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Capitalized R and D costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IndustrialRealEstateLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Industrial real estate lease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IndustrialRealEstateLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Industrial Real Estate Lease [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IndustrialRealEstateLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Proceeds from registered direct offering of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Issuance of Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from offering, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Increased number of shares available for future grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, $0.00001 par value; 250,000,000 shares authorized, 76,503,151 and 69,994,963 shares issued and outstanding at December 31, 2023 and December 31, 2022, respectively </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Value, Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Conversion of Stock, Shares Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock issuable upon conversion of convertible notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Changes in valuation allowance for deferred tax assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of customer. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of customers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax assets, capitalized research and development. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Capitalized Research and Development </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized research and development </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Liability, Revenue Recognized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred revenue, revenue recognized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accrued Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share-based compensation arrangement by share-based payment award, options outstanding, weighted average exercise price, and additional disclosures. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Exercise Price And Additional Disclosures [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Current Fiscal Year End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Current Fiscal Year End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Auditor Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Auditor Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Period Increase (Decrease) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected amount of unrecognized tax benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Unrecognized Tax Benefits, Period Increase (Decrease), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Income (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Loss from operations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating lease end date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease end date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SEC Schedule, 12-09, Valuation Allowances and Reserves Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsLiabilitiesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax assets liabilities gross. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsLiabilitiesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets Liabilities Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsLiabilitiesGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total deferred tax assets and liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxPeriodAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Period [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxPeriodAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ExecutiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Executive. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ExecutiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Executive [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ExecutiveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Executive [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EffectiveIncomeTaxRateReconciliationDeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Effective income tax rate reconciliation deductible expense share based compensation cost. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EffectiveIncomeTaxRateReconciliationDeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation Deductible Expense Share Based Compensation Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EffectiveIncomeTaxRateReconciliationDeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Stock-based compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Research and Development Expense [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Research and Development Expenses [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Notes [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value Per Share, Exercisable at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award options exercisable weighted average grant date fair value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ValuationAndQualifyingAccountsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Leases [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Payable and Accrued Liabilities Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk, Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration risk, percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock compensation expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Total stock-based compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payment, Tax Withholding, Share-Based Payment Arrangement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Payments made for employee restricted stock tax withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disaggregation Of Revenue [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Segment Reporting Information, by Segment [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Revenue and Segment Operating Profit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfClosingPricePerShareOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of closing price per share of common stock. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfClosingPricePerShareOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Closing Price Per Share Of Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfClosingPricePerShareOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of common stock closing price per share of conversion price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxesPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income taxes paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandAndTwentyTwoConvertibleNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Two Thousand And Twenty Two Convertible Notes Member </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandAndTwentyTwoConvertibleNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2022 Convertible Notes [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwoThousandAndTwentyTwoConvertibleNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> 2022 convertible notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue from Contracts with Customers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Impairment of Long-Lived Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Shares, Restricted Stock Award, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance of restricted stock, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Aggregate Intrinsic Value, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Aggregate Intrinsic Value, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Earnings per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PeriodOfOptionToPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Period of option to purchase. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PeriodOfOptionToPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Period of Option to Purchase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PeriodOfOptionToPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Period of option to purchase </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase (decrease) in operating lease right of use assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase Decrease In Operating Lease Right Of Use Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseDecreaseInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Reduction in the carrying amount of operating lease right-of-use assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale of Stock, Price Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock purchase price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Public offering price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Customer one. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer One [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer One [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Expenses [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating expenses: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property Plant and Equipment [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from External Customers by Geographic Areas [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Revenues, Based on Shipment Destination or Research Services Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Voluntary Filers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Voluntary Filers </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Events [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax assets operating lease liabilities. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets Operating Lease Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetsOperatingLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwrittenPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Underwritten public offering. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwrittenPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Underwritten Public Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwrittenPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Underwritten Public Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award options forfeited in period intrinsic value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Disclosure of accounting policy for other noncurrent assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Assets Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OfficeSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Office space </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OfficeSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Office Space </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OfficeSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Office space. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments and Contingencies Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Assets, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other long-term assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochStrategicPlatformsLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Koch Strategic Platforms, LLC . </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochStrategicPlatformsLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Koch Strategic Platforms L L C [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochStrategicPlatformsLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Koch Strategic Platforms LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochStrategicPlatformsLLCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Koch Strategic Platforms (KSP) [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based awards granted to purchase common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Number of Shares, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Accrued Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other accrued expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stockholders' Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Depreciation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Depreciation, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Depreciation expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Paid, Excluding Capitalized Interest, Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonQualifiedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non qualified stock options. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonQualifiedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Qualified Stock Options [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonQualifiedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-Qualified Stock Options [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAndJointDevelopmentAgreementAmendedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Supply and joint development agreement amended. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAndJointDevelopmentAgreementAmendedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supply And Joint Development Agreement Amended [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SupplyAndJointDevelopmentAgreementAmendedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supply and Joint Development Agreement Amended [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FairValueOfDebtConversionOptionIncreased_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Fair value of debt conversion option, increased. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FairValueOfDebtConversionOptionIncreased_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fair Value of Debt Conversion Option, Increased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FairValueOfDebtConversionOptionIncreased_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fair value of debt conversion option, increased </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act refundable tax credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CARES Act refundable tax credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> CARES Act refundable tax credit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateTerms_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Interest Rate Terms </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateTerms_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, interest rate terms </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity, Attributable to Parent [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stockholders' equity: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, after Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Thereafter </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate principal amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax liabilities operating lease right of use assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities Operating Lease Right Of Use Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Operating lease right-of-use assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cost of Goods and Services Sold, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost of Goods and Services Sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfGoodsAndServicesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lease Contractual Term [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net loss per share: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Maturities of Operating Lease Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel"> Total deferred tax liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Liabilities, Net, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounting Policies [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InitialConversionRateOfConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Initial conversion rate of convertible notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InitialConversionRateOfConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Initial Conversion Rate Of Convertible Notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InitialConversionRateOfConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Initial conversion rate of convertible notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segments [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeaseDescriptionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Lease, Description [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccelerationOfUnamortizedStockBasedCompensationCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Acceleration of unamortized stock-based compensation charges </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccelerationOfUnamortizedStockBasedCompensationCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Acceleration of Unamortized Stock-Based Compensation Charges </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AccelerationOfUnamortizedStockBasedCompensationCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Acceleration of unamortized stock-based compensation charges. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LatinAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Latin America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LatinAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Latin America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LatinAmericaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Latin America [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Balance at End of Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Balance at Beginning of Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk, Credit Risk, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration of Credit Risk </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease, weighted average lease not yet commenced, term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevolvingCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revolving Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepaid expenses and other current assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prepaid expenses and other current assets policy text block </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Prepaid expenses and other current assets policy. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amounts receivable for leased premises construction improvements. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amounts Receivable For Leased Premises Construction Improvements </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amount receivables as an aid to construction of improvements of the leased premise </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Earnings Per Share, Basic, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net loss per share, basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer Concentration Risk [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer Concentration Risk [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments and Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments and contingencies (Note 12) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, Plant and Equipment, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party, Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Changes in Contract Assets and Contract Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Rent expense incurred under operating leases </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShippingAndHandlingCostsClassifiedAsComponentOfCostOfRevenuePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Shipping and handling costs classified as component of cost of revenue, policy. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShippingAndHandlingCostsClassifiedAsComponentOfCostOfRevenuePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Shipping And Handling Costs Classified As Component Of Cost Of Revenue Policy Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShippingAndHandlingCostsClassifiedAsComponentOfCostOfRevenuePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Shipping and Handling Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of Shares, Expected to vest at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statistical Measurement [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statistical Measurement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash used in operating activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel"> Cash used in operations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetInterestExpenseLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Deferred tax asset interest expense limitation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetInterestExpenseLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Asset Interest Expense Limitation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DeferredTaxAssetInterestExpenseLimitation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest expense limitation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total intrinsic value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Period End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Period End Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statistical Measurement [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statistical Measurement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable, Allowance for Credit Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allowance for doubtful accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Accounts Receivable, Allowance for Credit Loss, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Accounts Receivable, Allowance for Credit Loss, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments and Contingencies Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments and Contingencies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplyCommitmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supply Commitment [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplyCommitmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supply Commitment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfCapitalizedImplementationCostsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of capitalized implementation costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfCapitalizedImplementationCostsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Capitalized Implementation Costs Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfCapitalizedImplementationCostsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Capitalized Implementation Costs are Classified on the Consolidated Balance Sheets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash payments related to operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Earnings Per Share, Diluted, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net loss per share, diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Product and Service [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Product and Service </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale and leaseback arrangement date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale Leaseback Transaction, Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cost of Sales [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cost of Product Revenue [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Operating Loss Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net operating loss carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Assets, Operating Loss Carryforwards, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized tax benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Unrecognized Tax Benefits, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Unrecognized Tax Benefits, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SEC Schedule, 12-09, Valuation Allowances and Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk Benchmark [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration Risk Benchmark </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue from Contract with Customer [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument, Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Credits against amounts invoiced on prepayment liability. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credits Against Amounts Invoiced On Prepayment Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credits against amounts invoiced </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of Shares, Exercisable at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExercisedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share based compensation arrangement by share based payment award options nonvested options exercised weighted average grant date fair value. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExercisedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Options Exercised Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExercisedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted Average Grant Date Fair Value Per Share, Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of Reportable Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of reportable segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Shares authorized. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total number of shares authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Additional Paid in Capital, Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additional paid-in capital </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesRelatedPartyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible notes related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesRelatedPartyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Notes Related Party [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesRelatedPartyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible Note - Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net deferred tax asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contract with customer liability additions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract With Customer Liability Additions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contract with customer liability deductions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract With Customer Liability Deductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerLiabilityDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Collateral Held [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RegisteredDirectOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Registered Direct Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RegisteredDirectOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Registered Direct Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RegisteredDirectOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Registered direct offering. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from employee stock option exercises, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Number of Shares, Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidation, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Principles of Consolidation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Other Adjustments, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities and Equity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Liabilities and Stockholders’ Equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Value, Restricted Stock Award, Forfeitures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Forfeiture of performance-based restricted stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplyCommitmentArrangementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Supply Commitment Arrangement [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplyCommitmentArrangementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supply Commitment Arrangement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Noncurrent Liabilities [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Other Long-term Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Thermal Barrier [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Thermal Barrier [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ThermalBarrierMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Thermal barrier. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Basis of presentation. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Basis Of Presentation [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_BasisOfPresentationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basis Of Presentation [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, Postal Zip Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, Postal Zip Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Interactive Data Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Interactive Data Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Private Placement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Private Placement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Selling and Marketing Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sales and marketing </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Selling and Marketing Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accounts Payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Accounts Payable, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credit Facility [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit Facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Silicon Valley Bank credit facility. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Silicon Valley Bank Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankCreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Silicon Valley Bank Credit Facility [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Less imputed interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Notes [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock Units, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Well-known Seasoned Issuer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Well-known Seasoned Issuer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployeeRetentionCreditsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee Retention Credits Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployeeRetentionCreditsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Employee retention credits receivable. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Incorporation, State or Country Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Incorporation, State or Country Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash and Cash Equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity Components [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Equity Components </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Liabilities Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act Payroll Tax Deferral </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accounts Receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Accounts receivable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Other Operating Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Other Operating Liabilities, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Paid, Capitalized, Investing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidCapitalized_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Capitalized Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value, Vested </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Local Phone Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Local Phone Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property Plant and Equipment [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale of Stock [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale of Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Exercisable at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer B [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Customer B. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Vesting of restricted stock units, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Cash, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Restricted cash to support our outstanding letters of credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement of Cash Flows [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Method Used </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of comparable companies for expected volatility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Organization, Consolidation and Presentation of Financial Statements [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, Plant and Equipment, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Information [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment Reporting Information [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gross Profit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Segment Operating Profit (Loss) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gross profit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk Benchmark [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration Risk Benchmark </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Annual Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Annual Report </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Par or Stated Value Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, par value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDevelopmentCostsAmortizationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Capitalized research and development costs amortization period. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDevelopmentCostsAmortizationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Capitalized Research and Development Costs amortization period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDevelopmentCostsAmortizationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized research and development costs amortization period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Compensation Liability, Classified, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred employer payroll tax obligation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Compensation Liability, Classified, Noncurrent, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income (Expense), Nonoperating, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNonoperatingNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest income (expense), net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Unrecognized compensation cost period for recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Lived Tangible Asset [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Lived Tangible Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtTheMarketOfferingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> At-The-Market Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtTheMarketOfferingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> At The Market Offerings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtTheMarketOfferingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> At-the-market offering. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Remittance date of deferred tax balance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Remittance Date Of Deferred Tax Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemittanceDateOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Remittance date of deferred tax balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Remaining Contractual Term, Expected to vest at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increased number of shares authorized for grant </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Maximum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Maximum [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt, Noncurrent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance and sale of convertible debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Convertible note </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PotentialImpactOfReimbursementFromCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Potential impact of reimbursement from customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PotentialImpactOfReimbursementFromCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Potential Impact of Reimbursement from Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PotentialImpactOfReimbursementFromCustomer_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Potential impact of reimbursement from customer. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfPrivatePlacement_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Issuance of Private Placement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfPrivatePlacement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from private placement of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidation Items [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_StandardProductWarrantyPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Standard product warranty period. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_StandardProductWarrantyPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Standard Product Warranty Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_StandardProductWarrantyPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Standard product warranty period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DescriptionOfBusinessAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Description of business. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DescriptionOfBusinessAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Description Of Business [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochDisruptiveTechnologiesLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Koch Disruptive Technologies LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochDisruptiveTechnologiesLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Koch Disruptive Technologies LLC [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_KochDisruptiveTechnologiesLlcMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Koch Disruptive Technologies LLC. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Percentage of deferred tax balance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Percentage Of Deferred Tax Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of deferred tax balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> APIC, Share-Based Payment Arrangement, Increase for Cost Recognition </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock compensation expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Standard Product Warranty Accrual, Period Increase (Decrease) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Warranty expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Standard Product Warranty Accrual, Period Increase (Decrease), Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Short-Term Debt, Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net (decrease) increase in cash, cash equivalents and restricted cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedCostsRelatedToImplementationOfAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Capitalized costs related to implementation of agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedCostsRelatedToImplementationOfAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Capitalized Costs Related To Implementation Of Agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedCostsRelatedToImplementationOfAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized costs related to implementation of agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryWorkInProcessNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Work in process </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryWorkInProcessNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Work in Process, Net of Reserves </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PayablesAndAccrualsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payables and Accruals [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DebtInstrumentTerminationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Debt instrument termination date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DebtInstrumentTerminationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument Termination Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DebtInstrumentTerminationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loan termination date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> General and Administrative Expense [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> General and Administrative Expenses [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Summary of significant accounting policies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Summary Of Significant Accounting Policies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary Of Significant Accounting Policies [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Number of Shares, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Financial Statement Error Correction [Flag] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Shares, Restricted Stock Award, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Forfeiture of performance-based restricted stock, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Segments [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingSegmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating Segment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Potentially Dilutive Common Shares Excluded from Computation of Diluted Net Loss Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Inventory, Current [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segment Information </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> City Area Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> City Area Code </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Inventory, Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PostemploymentBenefitsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Postemployment Benefits [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash flows from operating activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ConsolidationItemsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Consolidation Items [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InternationalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> International. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InternationalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> International [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_InternationalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> International [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds from Issuance of Long-Term Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from issuance of long-term debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfLongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Proceeds from Issuance of Long-Term Debt, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Accumulated depreciation and amortization </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> General and Administrative Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> General and administrative </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> General and Administrative Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandardProductWarrantyPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Standard Product Warranty, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StandardProductWarrantyPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Warranty </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Weighted Average Number of Shares Outstanding, Basic, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted average shares outstanding, basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Basic </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Fair Value of Option Awards Estimated by Use of Black-Scholes Option Pricing Model </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value Per Share, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expiring net operating losses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_GA_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> GEORGIA </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_GA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Georgia [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash flows from financing activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpensePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Research and Development Expense, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpensePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Research and Development </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Redemption price, percentage of principal amount redeemed </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Valuation and Qualifying Accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Gain (Loss) on Extinguishment of Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Gain on extinguishment of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Gain on extinguishment of debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Gain (Loss) on Extinguishment of Debt, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> C A R E S Act [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CARESActMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> C A R E S Act. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statement [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Option, Activity [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Stock Option Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts Receivable [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Related Party Transactions, by Related Party [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Contract with Customer, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred revenue </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Fiscal Period Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Fiscal Period Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total lease payments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemainingPercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Remaining percentage of deferred tax balance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemainingPercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Remaining Percentage Of Deferred Tax Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RemainingPercentageOfDeferredTaxBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Remaining percentage of deferred tax balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Payment in-kind. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payment In Kind </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentInKind_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Payment in-kind </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Related Party Transactions Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Related Party Transactions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollateralAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Collateral Held [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2025 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Statement [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Convertible Notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commitments and contingencies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commitments And Contingencies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommitmentsAndContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commitments And Contingencies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Anti-dilutive Securities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Asset, after Allowance for Credit Loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Contract with Customer, Asset, after Allowance for Credit Loss, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MachineryAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Machinery and Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MachineryAndEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Machinery and Equipment [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Letters of Credit Outstanding, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LettersOfCreditOutstandingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Letters of credit outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Deferred Tax Assets and Liabilities [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Deferred Tax Assets and Deferred Tax Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts receivable, net of allowances of $230 and $255 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accounts Receivable, after Allowance for Credit Loss, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock 0.00001 Par Value [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountsAndCommissionsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Underwriting discounts and commissions net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountsAndCommissionsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Underwriting Discounts And Commissions Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountsAndCommissionsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Underwriting discounts and commissions, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountsAndCommissionsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Underwriting discounts and commissions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActEmployeeRetentionCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act Employee Retention Credits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActEmployeeRetentionCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CARES Act Employee Retention Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActEmployeeRetentionCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> CARES Act employee retention credit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents, at Carrying Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash and cash equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cash and Cash Equivalents, at Carrying Value, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Unrestricted cash and cash equivalents </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Stock Based Compensation Included in Cost of Sales or Operating Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Exercisable at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Building [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Buildings [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Common Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Entity Common Stock, Shares Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Antidilutive Securities, Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Antidilutive Securities, Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtNoncurrentRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible debt noncurrent - related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtNoncurrentRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt Noncurrent Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtNoncurrentRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateCapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Rate Cap [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestRateCapMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cap Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Revenue recognition. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue Recognition [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevenueRecognitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revenue Recognition [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cover </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cover [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditLimitPercentageOnPrepaymentBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Credit limit percentage on prepayment balance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditLimitPercentageOnPrepaymentBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credit Limit Percentage On Prepayment Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CreditLimitPercentageOnPrepaymentBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit limit percentage on prepayment balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Fiscal Year Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Fiscal Year Focus </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest and penalties related to unrecognized tax benefits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale of Stock [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale of Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNoteIfConvertedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible note, if converted. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNoteIfConvertedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Note If Converted [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNoteIfConvertedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible note, if converted Member </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred Stock 0.00001 Par Value [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Rule10B51 Arr Modified Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non rule10B51 Arr modified flag. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfPrepaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule of prepayment liability. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfPrepaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Prepayment Liability Table [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfPrepaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Prepayment Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Security Exchange Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Security Exchange Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Domestic Tax Authority [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Federal [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> New Accounting Pronouncements, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Recently Issued Accounting Standards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Shares Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, shares issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, shares authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Property, plant and equipment, gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Property, Plant and Equipment, Gross, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Property, Plant and Equipment, Gross, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Property, Plant and Equipment, Gross, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State rate change </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Right-of-Use Asset Obtained in Exchange for Operating Lease Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Right-of-use assets obtained in exchange for new operating lease liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmendedAndRestatedLoanAndSecurityAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Amended and restated loan and security agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmendedAndRestatedLoanAndSecurityAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amended And Restated Loan And Security Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AmendedAndRestatedLoanAndSecurityAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Loan Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Deductions to Allowances for Uncollectible Accounts </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseInDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Increase in debt discount due to modification of convertible note related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseInDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase In Debt Discount Due To Modification Of Convertible Note Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncreaseInDebtDiscountDueToModificationOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Increase in debt discount due to modification of convertible note - related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Diluted [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted-average common shares outstanding: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Employees [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Other Employees [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Other employees. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Grants, Vesting, and Forfeitures of RSUs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Value, Stock Options Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from employee stock option exercises </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Emerging Growth Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Emerging Growth Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SubseaProjectsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Subsea projects. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SubseaProjectsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsea Projects [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SubseaProjectsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Subsea Projects [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SubseaProjectsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Subsea Projects [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate intrinsic value of options exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Aggregate Intrinsic Value, Exercised </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Summary of significant accounting policies. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Summary Of Significant Accounting Policies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary Of Significant Accounting Policies [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amendment Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amendment Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Stock Issued During Period, Value, Restricted Stock Award, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance of restricted stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Accrued Liabilities [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Accrued Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFeesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Commissions and fees net. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFeesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Commissions And Fees Net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommissionsAndFeesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Commissions and fees net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAndRestrictedStockUnitsRsuMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock And Restricted Stock Units RSU [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAndRestrictedStockUnitsRsuMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock And Restricted Stock Units Rsu [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAndRestrictedStockUnitsRsuMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock and Restricted Stock Units RSU [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerPrepaymentLiabilityRepayment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Repayment of prepayment liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerPrepaymentLiabilityRepayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract With Customer Prepayment Liability Repayment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerPrepaymentLiabilityRepayment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contract with customer prepayment liability repayment. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Gross [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred tax liabilities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Leases [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Variable Rate [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxPeriodDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Tax Period [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxPeriodDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible debt amortized cost. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt Amortized Cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtAmortizedCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible debt carried at amortized cost </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity File Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity File Number </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cloud computing costs included in other assets. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cloud Computing Costs Included In Other Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingCostsIncludedInOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cloud computing costs included in other assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Expiration Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Senior secured term loan, Draw Endining date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Gross </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total gross deferred tax assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contract with customer asset deductions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract With Customer Asset Deductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetDeductions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deductions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Aggregate Intrinsic Value, Expected to vest at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ServiceBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Service Based Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ServiceBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Service Based Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ServiceBasedAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Service Based Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disclosure of Compensation Related Costs, Share-based Payments [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share-based compensation arrangement by share-based payment award, number of shares issued or reserved for issuance. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Issued Or Reserved For Issuance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of shares either issued or reserved in connection with statutory tax withholdings </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExpiryYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating lease expiry year. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExpiryYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease Expiry Year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseExpiryYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease expiry year </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accounts Payable, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accounts payable </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Accounts Payable, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt Instrument </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentsOfFeesAndIssuanceCostsFromPrivatePlacementOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Payments of fees and issuance costs from private placement of common stock. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentsOfFeesAndIssuanceCostsFromPrivatePlacementOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments Of Fees And Issuance Costs From Private Placement Of Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PaymentsOfFeesAndIssuanceCostsFromPrivatePlacementOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Fees and issuance costs from private placement of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevolvingLineOfCreditTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Revolving line of credit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevolvingLineOfCreditTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revolving Line Of Credit [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RevolvingLineOfCreditTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Revolving Line of Credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Weighted Average Grant Date Fair Value, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Weighted Average Grant Date Fair Value, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Common stock options. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock Options [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common Stock Options [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Valuation Allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Valuation allowance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeExpenseNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income (Expense), Net [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total operating expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Corporate expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeasesRentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating leases rent expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeasesRentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Leases Rent Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeasesRentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease annual base rent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockPerCapitalizedPrincipal_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Common stock per capitalized principal. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockPerCapitalizedPrincipal_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock Per Capitalized Principal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockPerCapitalizedPrincipal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock per capitalized principal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Auditor Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Auditor Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected term (in years) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, Address Line Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, Address Line Two </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Preferred stock, $0.00001 par value; 5,000,000 shares authorized, no shares issued or outstanding at December 31, 2023 and 2022 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Preferred Stock, Value, Issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Small Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Small Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Shell Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Shell Company </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number of Operating Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of segment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Title of Individual [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Title of Individual </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Lessee operating lease liability payments not yet commenced. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee Operating Lease Liability Payments Not Yet Commenced </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease liability payments not yet commenced </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromIssuanceOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from issuance of convertible note related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromIssuanceOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds From Issuance Of Convertible Note Related Party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromIssuanceOfConvertibleNoteRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Proceeds from issuance of convertible note related party. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Unused Capacity, Commitment Fee Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Percentage of unused portion of facility, monthly fee </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_Rule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Rule 10b5-1 Arr Modified Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_Rule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Rule 10b5-1 Arr Modified Flag </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible debt principal amount. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt Principal Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Issuance and sale of convertible notes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleDebtPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Convertible note, principal </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of subsidiaries. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Subsidiaries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfSubsidiaries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of Subsidiaries </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Earnings Per Share [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net Loss Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Address, Address Line One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Entity Address, Address Line One </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Revenue Benchmark [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Total Revenue [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseRentIncreasePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating lease rent increase percent. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseRentIncreasePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease Rent Increase Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseRentIncreasePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease increased percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PurchasePriceOfNotesPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Purchase price of notes percentage. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PurchasePriceOfNotesPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Purchase Price Of Notes Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PurchasePriceOfNotesPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase price of notes percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Antidilutive Securities [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Antidilutive Securities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantPurchaseCommitmentDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Purchase Commitment, Description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantPurchaseCommitmentDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase commitment, description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Interest Rate During Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, interest rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Weighted Average Grant Date Fair Value Per Share, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Weighted Average Grant Date Fair Value Per Share, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeAndInterestExpenseDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Income and Interest Expense Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestIncomeAndInterestExpenseDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other Income (Expense) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployeeRetentionCreditsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Retention Credits </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployeeRetentionCreditsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee Retention Credits [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployeeRetentionCreditsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Employee retention credits. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwentyTwentyThreeEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2023 Equity Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwentyTwentyThreeEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Twenty Twenty Three Equity Plan [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_TwentyTwentyThreeEquityPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> 2023 Equity Plan. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LiquidityPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Liquidity. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LiquidityPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liquidity Policy [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LiquidityPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Liquidity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of trading days. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Trading Days </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of trading days on conversion price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement Location [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Statement Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Silicon Valley Bank. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_SiliconValleyBankMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Silicon Valley Bank [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedOrExpectedToVestWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value Per Share, Expected to vest at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedOrExpectedToVestWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Vested Or Expected To Vest Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedOrExpectedToVestWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Vested Or Expected To Vest Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NetOperatingLossesExpirationDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Net operating losses expiration description. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NetOperatingLossesExpirationDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Operating Losses Expiration Description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NetOperatingLossesExpirationDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net operating losses available to offset future state taxable income expiration description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Expected dividend yield </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Liability [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Contract liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Debt, Type [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-term Debt, Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Income (Loss), Including Portion Attributable to Noncontrolling Interest </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> 2028 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lessee, Operating Lease, Liability, to be Paid, Year Five </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Non-employee director. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Non Employee Director [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NonEmployeeDirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Non-Employee Directors [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Lender [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Line of Credit Facility, Lender </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase commitments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermPurchaseCommitmentAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Purchase Commitment, Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Stock-based awards shares awarded </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfOptionsWithModifiedVestingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Number of options with modified vesting term. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfOptionsWithModifiedVestingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Number Of Options With Modified Vesting Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_NumberOfOptionsWithModifiedVestingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Number of options with modified vesting term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Product and Service [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Product and Service </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Title of 12(b) Security </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Title of 12(b) Security </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementFeeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Management Fee Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementFeeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Management fees </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Allowance for doubtful accounts receivable and sales return reserve. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Allowance For Doubtful Accounts Receivable And Sales Return Reserve </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnReserve_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Allowance for accounts receivable and contract assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Lease Contractual Term [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrimeRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prime Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrimeRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prime Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DiscountOnConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Discount on convertible debt. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DiscountOnConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Discount On Convertible Debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_DiscountOnConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Discount on convertible note </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromCustomerAdvances_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Proceeds from customer advances. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromCustomerAdvances_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Proceeds From Customer Advances </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromCustomerAdvances_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepayment proceeds under customer supply agreement </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ProceedsFromCustomerAdvances_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Prepayment proceeds under customer supply agreement, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Customer two. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Customer Two [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CustomerTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Customer Two [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Permanent differences </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Prepaid Expenses and Other Current Assets [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Prepaid Expenses and Other Current Assets [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash flows from investing activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Amortization of Debt Issuance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Amortization of debt issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_RI_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> RHODE ISLAND </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_RI_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Rhode Island [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> State and Local Jurisdiction [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State and Local Jurisdiction [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Segment Reporting, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Segments </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Lived Tangible Asset [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Long-Lived Tangible Asset </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RobertMGervisMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Robert M. Gervis [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RobertMGervisMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Robert M. Gervis [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Subsequent Event [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Inventories </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Inventories, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract with Customer, Liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Contract with Customer, Liability, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCreditPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act refundable tax credit percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCreditPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CARES Act refundable tax credit percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActRefundableTaxCreditPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> CARES Act refundable tax credit percentage. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Defined Contribution Plan, Employer Discretionary Contribution Amount </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Matching contribution during the period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Remaining Contractual Term, Exercisable at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock, Shares, Outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock, shares outstanding </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Common Stock, Shares, Outstanding, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Common Stock, Shares, Outstanding, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Risk free rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Payment Arrangement [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee Stock Ownership Plans </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Grant Date Fair Value, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted Stock Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Stock Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedStockAwardsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Stock Awards [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Charges to Costs and Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Concentration Risk Type [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Concentration Risk Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted average fair value: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Statement Location [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Statement Location </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Granted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Document Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Document Type </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Line of Credit Facility, Current Borrowing Capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Available borrowing capacity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Amount available under revolving line of credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Investing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash used in investing activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Counterparty Name [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Counterparty Name </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Grant-date fair value of options vested </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIssuanceDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Issuance Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIssuanceDate1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Debt instrument, issuance date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedResearchAndDevelopmentCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized research and development costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestCostsIncurredCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized interest on convertible debt </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestCostsIncurredCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Capitalized Interest Costs, Including Allowance for Funds Used During Construction </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestCostsIncurredCapitalized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Capitalized Interest Costs, Including Allowance for Funds Used During Construction, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnterpriseResourcePlanningSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Enterprise Resource Planning Software. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnterpriseResourcePlanningSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Enterprise Resource Planning Software [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnterpriseResourcePlanningSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Enterprise Resource Planning Software [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Restricted Stock Units, Forfeited </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployerPayrollTaxObligationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Employer payroll tax obligation period. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployerPayrollTaxObligationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employer Payroll Tax Obligation Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EmployerPayrollTaxObligationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employer payroll tax obligation period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net cash provided by financing activities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Authorized for issuance, number of shares increased by </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Entity Filer Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Entity Filer Category </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Supplemental disclosures of non-cash activities: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Expired </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Balance Sheet Location [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Increase (Decrease) in Accrued Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Accrued expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Increase (Decrease) in Accrued Liabilities, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Variable Rate [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VariableRateAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Variable Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Accrued Liabilities, Current [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Loss Carryforwards, Expiration Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsExpirationDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net operating loss carryforwards expiration date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Income Taxes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Taxes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_IncomeTaxesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Nonoperating Income (Expense) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total other income (expense) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other expense, net </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Credit Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Tax credit carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Assets, Tax Credit Carryforwards, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total liabilities </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Property, Plant and Equipment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Property Plant And Equipment [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Description of Variable Rate Basis </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest rate description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionNetBookValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale and leaseback equipment value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionNetBookValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale Leaseback Transaction, Net Book Value </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionNetBookValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Sale Leaseback Transaction, Net Book Value, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Equity, Attributable to Parent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Ending balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Beginning balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Total stockholders' equity </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Fees and issuance costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fees And Issuance Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Fees and issuance costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceFeesAndOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Common stock issuance fees and offering expenses. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceFeesAndOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Common Stock Issuance Fees And Offering Expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CommonStockIssuanceFeesAndOfferingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Common stock issuance fees and offering expenses </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> SOFR Plus [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Documents Incorporated by Reference [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Documents Incorporated by Reference </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDovelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Capitalized research and dovelopment expense. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDovelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Capitalized Research And Dovelopment Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CapitalizedResearchAndDovelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Capitalized R&D costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Convertible notes. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConvertibleNotesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Notes [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Net loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Net loss </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Net loss incurred </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetRegulatoryAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Net Regulatory Assets [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Nonoperating Income (Expense) [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Other income (expense) </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Interest expense, related party </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Interest Expense </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Interest Expense, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Business Description and Basis of Presentation [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Description of Business </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_Contractwithcustomerprepaymentliabilityrepayment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> ContractWithCustomerPrepaymentLiabilityRepayment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_Contractwithcustomerprepaymentliabilityrepayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> ContractWithCustomerPrepaymentLiabilityRepayment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_Contractwithcustomerprepaymentliabilityrepayment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Repayment of prepayment liability </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShareDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Conversion notes effective conversion price per share decrease. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShareDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Conversion Notes Effective Conversion Price Per Share Decrease </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ConversionNotesEffectiveConversionPricePerShareDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Conversion notes effective conversion price per share decrease </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cash and Cash Equivalents [Domain] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> State tax, net of federal benefit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Convertible Debt [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleDebtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible Note [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Statement of Financial Position [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Basis of Presentation and Significant Accounting Policies [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Summary of Basis of Presentation and Significant Accounting Policies </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Weighted Average Number of Shares Outstanding, Diluted, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Weighted Average Number of Shares Outstanding, Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Weighted average shares outstanding, diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Diluted </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Redemption, Description </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible notes redemption terms </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Weighted Average Exercise Price Per Share, Expected to vest at December 31, 2023 </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule of Reconciliation Between U.S. Statutory Income Tax Rate and Company's Effective Rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Credit Facility [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Credit Facility </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Effective Income Tax Rate Reconciliation, Percent </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Effective tax rate </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionLeaseTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Sale and leaseback rent payment term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleLeasebackTransactionLeaseTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Sale Leaseback Transaction, Lease Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Chief Executive Officer and Certain Other Employees [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Chief Executive Officer And Certain Other Employees [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Chief executive officer and certain other employees. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments to Acquire Productive Assets </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cash for capital expenditures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireProductiveAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Payments to Acquire Productive Assets, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Reserves and accruals </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease, Weighted Average Remaining Lease Term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Operating lease, weighted average remaining lease term </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionPricePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Debt Instrument, Redemption Price, Percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRedemptionPricePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Convertible notes redemption percentage </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Use of Estimates, Policy [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Use of Estimates </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Disclosure [Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Taxes </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedCashPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Restricted cash. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedCashPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Restricted Cash [Policy Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_RestrictedCashPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Restricted Cash </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Deferred Tax Assets, Net [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Deferred tax assets: </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermPurchaseCommitmentPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Purchase commitments spent over period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermPurchaseCommitmentPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Long-Term Purchase Commitment, Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCostsFromRegisteredDirectOfferingOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Fees and issuance costs from registered direct offering of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCostsFromRegisteredDirectOfferingOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Fees And Issuance Costs From Registered Direct Offering Of Common Stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FeesAndIssuanceCostsFromRegisteredDirectOfferingOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Fees and issuance costs from registered direct offering of common stock </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Weighted Average Exercise Price Per Share, Ending Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel"> Weighted Average Exercise Price Per Share, Beginning Balance </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LoanAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Loan Agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_LoanAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Loan Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ValuationAndQualifyingAccountsDisclosureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ValuationAndQualifyingAccountsDisclosureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Valuation and Qualifying Accounts Disclosure [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Computation of Basic and Diluted Net Loss Per Share </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActQualifiedWagesPerEmployeeForRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> CARES Act qualified wages per employee for refundable tax credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActQualifiedWagesPerEmployeeForRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> CARES Act qualified wages per employee for refundable tax credit </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CaresActQualifiedWagesPerEmployeeForRefundableTaxCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> CARES Act qualified wages per employee for refundable tax credit. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Disaggregation of Revenue [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Disaggregation Of Revenue [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Leasehold Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Leasehold Improvements [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PreConstructionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Pre-construction costs. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PreConstructionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Pre Construction Costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_PreConstructionCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Pre-construction costs </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Authority [Axis] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Income Tax Authority </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountAndCommission_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Underwriting discount and commission. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountAndCommission_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Underwriting Discount And Commission </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_UnderwritingDiscountAndCommission_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Underwriting discounts and commissions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> At-the-market offering. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> At Market Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_AtMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> At The Market Offering [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseBeginningDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Operating lease beginning date. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseBeginningDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Lease Beginning Date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_OperatingLeaseBeginningDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Lease commence date </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Contract with customer asset additions. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Contract With Customer Asset Additions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ContractWithCustomerAssetAdditions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Additions </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Payments to Acquire Property, Plant, and Equipment </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Capital expenditures </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Payments to Acquire Property, Plant, and Equipment, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Cloud Computing Agreement. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Cloud Computing Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_CloudComputingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Cloud Computing Agreement [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel"> Restricted Stock Units, Vested </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Proceeds from offering, net, shares </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel"> Common stock sold </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Underwritten public offering, shares issued </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Employee-related Liabilities, Current </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Employee compensation </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Employee-related Liabilities, Current, Total </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnergyIndustrialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Energy Industrial [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnergyIndustrialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Energy Industrial [Member] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_EnergyIndustrialMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Energy industrial. </link:label>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel"> Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total </link:label>
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<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel"> Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Income Tax Disclosure [Abstract] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Schedule Of Basis Of Presentation [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Schedule Of Basis Of Presentation [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_ScheduleOfBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Schedule Of Basis Of Presentation [Table] </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Operating Loss Carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Net operating loss carryforwards </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FundedAmountForOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation"> Funded amount for operations. </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FundedAmountForOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label"> Funded Amount for Operations </link:label>
<link:label xml:lang="en-US" xlink:type="resource" xlink:label="aspn_FundedAmountForOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel"> Funded amount for operations </link:label>
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<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_MajorCustomersAxis" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerOneMember" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivable" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_TitleOfIndividualAxis" order="3" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerTwoMember" order="3" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ConcentrationRiskPercentage1" order="3" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" order="4.0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="us-gaap_AwardTypeAxis" order="4" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_NumberOfCustomer" order="4" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" order="5.0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_RangeAxis" order="5" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_StandardProductWarrantyPeriod" order="5" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="aspn_SummaryOfSignificantAccountingPoliciesLineItems" order="6" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" order="6" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" order="7" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" order="8" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue" order="9" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" order="10" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" order="11" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_PeriodOfOptionToPurchase" order="12" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_FundedAmountForOperations" order="13" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ManagementFeeExpense" order="14" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_NumberOfOperatingSegments" order="15" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_EmployeeRetentionCreditsReceivable" order="16" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_OfficeSpace" order="17" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/>
</link:presentationLink>
<link:presentationLink xlink:role="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevenueFromContractsWithCustomersAdditionalInformationDetails" xlink:title="presentationLink" xlink:type="extended">
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RevenueRecognitionTable" xlink:label="aspn_RevenueRecognitionTable"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis" xlink:label="srt_ProductOrServiceAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EnergyIndustrialMember" xlink:label="aspn_EnergyIndustrialMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RevenueRecognitionLineItems" xlink:label="aspn_RevenueRecognitionLineItems"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NumberOfPerformanceObligations" xlink:label="aspn_NumberOfPerformanceObligations"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ThermalBarrierContractsMember" xlink:label="aspn_ThermalBarrierContractsMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SalesReturnReserve" xlink:label="aspn_SalesReturnReserve"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EVThermalBarrierMember" xlink:label="aspn_EVThermalBarrierMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" xlink:label="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SubseaProjectsMember" xlink:label="aspn_SubseaProjectsMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionTable" xlink:to="srt_ProductOrServiceAxis" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_EnergyIndustrialMember" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="aspn_RevenueRecognitionTable" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="aspn_NumberOfPerformanceObligations" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionTable" xlink:to="srt_RangeAxis" order="1" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" order="1" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_ThermalBarrierContractsMember" order="1" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="aspn_SalesReturnReserve" order="1" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionTable" xlink:to="aspn_RevenueRecognitionLineItems" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_EVThermalBarrierMember" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" order="2" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_SubseaProjectsMember" order="3" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" order="3" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" order="4" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
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<link:presentationLink xlink:role="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevenueFromContractsWithCustomersSummaryOfRevenueDisaggregatedByGeographicalRegionAndSourceOfRevenueDetail" xlink:title="presentationLink" xlink:type="extended">
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis" xlink:label="srt_StatementGeographicalAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain" xlink:label="srt_SegmentGeographicalDomain"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember" xlink:label="srt_AsiaMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="us-gaap_DisaggregationOfRevenueTable"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EnergyIndustrialMember" xlink:label="aspn_EnergyIndustrialMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis" xlink:label="srt_ProductOrServiceAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CA" xlink:label="country_CA"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ThermalBarrierMember" xlink:label="aspn_ThermalBarrierMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EuropeMember" xlink:label="srt_EuropeMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LatinAmericaMember" xlink:label="srt_LatinAmericaMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US" xlink:label="country_US"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_InternationalMember" xlink:label="aspn_InternationalMember"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_AsiaMember" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DisaggregationOfRevenueTable" xlink:to="srt_StatementGeographicalAxis" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_EnergyIndustrialMember" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_DisaggregationOfRevenueTable" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" order="0" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
<link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_CA" order="1" priority="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
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<link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_BasisOfPresentationLineItems" xlink:to="us-gaap_ConvertibleDebtNoncurrent" priority="2" use="optional"/>
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<link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_BasisOfPresentationLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_BasisOfPresentationLineItems" xlink:to="us-gaap_SaleOfStockPricePerShare" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_BasisOfPresentationLineItems" xlink:to="aspn_UnderwritingDiscountsAndCommissionsNet" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_BasisOfPresentationLineItems" xlink:to="aspn_CommonStockIssuanceOfferingExpenses" priority="2" use="optional"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:label="aspn_SummaryOfSignificantAccountingPoliciesTable"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_FundedAmountForOperations" xlink:label="aspn_FundedAmountForOperations"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OfficeSpace" xlink:label="aspn_OfficeSpace"/>
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<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="us-gaap_ConcentrationRiskByBenchmarkAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerAMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_MajorCustomersAxis" xlink:to="srt_NameOfMajorCustomerDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_MajorCustomersAxis" xlink:to="srt_NameOfMajorCustomerDomain_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ProvisionForDoubtfulAccounts" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskTypeDomain" xlink:to="us-gaap_CustomerConcentrationRiskMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="srt_ChiefExecutiveOfficerMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockUnitsRSUMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="us-gaap_AccountsReceivableMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="us-gaap_ConcentrationRiskByTypeAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerBMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_RestrictedCashCurrent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="aspn_CARESActMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_MajorCustomersAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerOneMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivable" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_TitleOfIndividualAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_NameOfMajorCustomerDomain" xlink:to="aspn_CustomerTwoMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ConcentrationRiskPercentage1" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="us-gaap_AwardTypeAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_NumberOfCustomer" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_StandardProductWarrantyPeriod" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_PeriodOfOptionToPurchase" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_FundedAmountForOperations" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ManagementFeeExpense" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="us-gaap_NumberOfOperatingSegments" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_EmployeeRetentionCreditsReceivable" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_SummaryOfSignificantAccountingPoliciesLineItems" xlink:to="aspn_OfficeSpace" priority="2" use="optional"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevenueFromContractsWithCustomersAdditionalInformationDetails">
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RevenueRecognitionLineItems" xlink:label="aspn_RevenueRecognitionLineItems"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RevenueRecognitionTable" xlink:label="aspn_RevenueRecognitionTable"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis" xlink:label="srt_ProductOrServiceAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EnergyIndustrialMember" xlink:label="aspn_EnergyIndustrialMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NumberOfPerformanceObligations" xlink:label="aspn_NumberOfPerformanceObligations"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain_default"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ThermalBarrierContractsMember" xlink:label="aspn_ThermalBarrierContractsMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SalesReturnReserve" xlink:label="aspn_SalesReturnReserve"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EVThermalBarrierMember" xlink:label="aspn_EVThermalBarrierMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" xlink:label="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SubseaProjectsMember" xlink:label="aspn_SubseaProjectsMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="aspn_RevenueRecognitionTable" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_RevenueRecognitionTable" xlink:to="srt_ProductOrServiceAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_EnergyIndustrialMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="aspn_NumberOfPerformanceObligations" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_RevenueRecognitionTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_ThermalBarrierContractsMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="aspn_SalesReturnReserve" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_EVThermalBarrierMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="aspn_SubseaProjectsMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_RevenueRecognitionLineItems" xlink:to="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" priority="2" use="optional"/>
</link:definitionLink>
<link:definitionLink xlink:type="extended" xlink:role="http://www.aerogel.com/20231231/taxonomy/role/Role_DisclosureRevenueFromContractsWithCustomersSummaryOfRevenueDisaggregatedByGeographicalRegionAndSourceOfRevenueDetail">
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="us-gaap_DisaggregationOfRevenueLineItems"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="us-gaap_DisaggregationOfRevenueTable"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis" xlink:label="srt_StatementGeographicalAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain" xlink:label="srt_SegmentGeographicalDomain"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain" xlink:label="srt_SegmentGeographicalDomain_default"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember" xlink:label="srt_AsiaMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain" xlink:label="srt_ProductsAndServicesDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EnergyIndustrialMember" xlink:label="aspn_EnergyIndustrialMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis" xlink:label="srt_ProductOrServiceAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CA" xlink:label="country_CA"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ThermalBarrierMember" xlink:label="aspn_ThermalBarrierMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EuropeMember" xlink:label="srt_EuropeMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LatinAmericaMember" xlink:label="srt_LatinAmericaMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US" xlink:label="country_US"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_InternationalMember" xlink:label="aspn_InternationalMember"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DisaggregationOfRevenueLineItems" xlink:to="us-gaap_DisaggregationOfRevenueTable" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_AsiaMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DisaggregationOfRevenueTable" xlink:to="srt_StatementGeographicalAxis" priority="2" use="optional"/>
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<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" priority="2" use="optional"/>
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<link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="aspn_InternationalMember" priority="2" use="optional"/>
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="us-gaap_RevolvingCreditFacilityMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CollateralDomain" xlink:label="us-gaap_CollateralDomain_default"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermAxis" xlink:label="us-gaap_LeaseContractualTermAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermDomain" xlink:label="us-gaap_LeaseContractualTermDomain_default"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_LandlordMember" xlink:label="aspn_LandlordMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseCost" xlink:label="us-gaap_OperatingLeaseCost"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquipmentMember" xlink:label="us-gaap_EquipmentMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeasePayments" xlink:label="us-gaap_OperatingLeasePayments"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced" xlink:label="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:label="us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NumberOfSquareFeetForLease" xlink:label="aspn_NumberOfSquareFeetForLease"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseBeginningDate" xlink:label="aspn_OperatingLeaseBeginningDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseEndDate" xlink:label="aspn_OperatingLeaseEndDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeasesRentExpense" xlink:label="aspn_OperatingLeasesRentExpense"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseRentIncreasePercent" xlink:label="aspn_OperatingLeaseRentIncreasePercent"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseExtendedTerm" xlink:label="aspn_OperatingLeaseExtendedTerm"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_AmountsReceivableForLeasedPremisesConstructionImprovements" xlink:label="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashCurrent" xlink:label="us-gaap_RestrictedCashCurrent"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="us-gaap_LettersOfCreditOutstandingAmount"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DebtInstrumentTerminationDate" xlink:label="aspn_DebtInstrumentTerminationDate"/>
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<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_LesseeLeaseDescriptionTable" xlink:to="us-gaap_CollateralAxis" priority="2" use="optional"/>
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<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LeaseContractualTermAxis" xlink:to="us-gaap_LeaseContractualTermDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LeaseContractualTermAxis" xlink:to="us-gaap_LeaseContractualTermDomain_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RepurchaseAgreementCounterpartyNameDomain" xlink:to="aspn_LandlordMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_OperatingLeaseCost" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_LesseeLeaseDescriptionTable" xlink:to="srt_CounterpartyNameAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CollateralDomain" xlink:to="us-gaap_EquipmentMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_OperatingLeasePayments" priority="2" use="optional"/>
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<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_LesseeLeaseDescriptionTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_LesseeLeaseDescriptionTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_NumberOfSquareFeetForLease" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_OperatingLeaseBeginningDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_OperatingLeaseEndDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_OperatingLeasesRentExpense" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_OperatingLeaseRentIncreasePercent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_OperatingLeaseExtendedTerm" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_RestrictedCashCurrent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="us-gaap_LettersOfCreditOutstandingAmount" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeLeaseDescriptionLineItems" xlink:to="aspn_DebtInstrumentTerminationDate" priority="2" use="optional"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CommitmentsAndContingenciesLineItems" xlink:label="aspn_CommitmentsAndContingenciesLineItems"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CommitmentsAndContingenciesTable" xlink:label="aspn_CommitmentsAndContingenciesTable"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplyCommitmentAxis" xlink:label="us-gaap_SupplyCommitmentAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis" xlink:label="srt_CounterpartyNameAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermDomain" xlink:label="us-gaap_LeaseContractualTermDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_IndustrialRealEstateLeaseMember" xlink:label="aspn_IndustrialRealEstateLeaseMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplyCommitmentArrangementMember" xlink:label="us-gaap_SupplyCommitmentArrangementMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SupplyCommitmentArrangementMember" xlink:label="us-gaap_SupplyCommitmentArrangementMember_default"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SiliconValleyBankCreditFacilityMember" xlink:label="aspn_SiliconValleyBankCreditFacilityMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CloudComputingAgreementMember" xlink:label="aspn_CloudComputingAgreementMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="us-gaap_RevolvingCreditFacilityMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTerm" xlink:label="us-gaap_DebtInstrumentTerm"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermAxis" xlink:label="us-gaap_LeaseContractualTermAxis"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EnterpriseResourcePlanningSoftwareMember" xlink:label="aspn_EnterpriseResourcePlanningSoftwareMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ThermalBarrierContractsMember" xlink:label="aspn_ThermalBarrierContractsMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CapitalizedCostsRelatedToImplementationOfAgreement" xlink:label="aspn_CapitalizedCostsRelatedToImplementationOfAgreement"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OEMMember" xlink:label="aspn_OEMMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SupplyAndJointDevelopmentAgreementAmendedMember" xlink:label="aspn_SupplyAndJointDevelopmentAgreementAmendedMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SignificantPurchaseCommitmentDescription" xlink:label="us-gaap_SignificantPurchaseCommitmentDescription"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_BasfMember" xlink:label="aspn_BasfMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_SupplyAgreementExpirationDate" xlink:label="aspn_SupplyAgreementExpirationDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_LandlordMember" xlink:label="aspn_LandlordMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CustomerAdvancesGross" xlink:label="aspn_CustomerAdvancesGross"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CreditLimitPercentageOnPrepaymentBalance" xlink:label="aspn_CreditLimitPercentageOnPrepaymentBalance"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ProceedsFromCustomerAdvances" xlink:label="aspn_ProceedsFromCustomerAdvances"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability" xlink:label="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_Contractwithcustomerprepaymentliabilityrepayment" xlink:label="aspn_Contractwithcustomerprepaymentliabilityrepayment"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashCurrent" xlink:label="us-gaap_RestrictedCashCurrent"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="us-gaap_LettersOfCreditOutstandingAmount"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DebtInstrumentTerminationDate" xlink:label="aspn_DebtInstrumentTerminationDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NumberOfSquareFeetForLease" xlink:label="aspn_NumberOfSquareFeetForLease"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseEndDate" xlink:label="aspn_OperatingLeaseEndDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseBeginningDate" xlink:label="aspn_OperatingLeaseBeginningDate"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeasesRentExpense" xlink:label="aspn_OperatingLeasesRentExpense"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseRentIncreasePercent" xlink:label="aspn_OperatingLeaseRentIncreasePercent"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OperatingLeaseExtendedTerm" xlink:label="aspn_OperatingLeaseExtendedTerm"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_AmountsReceivableForLeasedPremisesConstructionImprovements" xlink:label="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseholdImprovementsGross" xlink:label="us-gaap_LeaseholdImprovementsGross"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseCost" xlink:label="us-gaap_OperatingLeaseCost"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermPurchaseCommitmentAmount" xlink:label="us-gaap_LongTermPurchaseCommitmentAmount"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InvestmentCompanyCommittedCapital" xlink:label="us-gaap_InvestmentCompanyCommittedCapital"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermPurchaseCommitmentPeriod" xlink:label="us-gaap_LongtermPurchaseCommitmentPeriod"/>
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<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_CounterpartyNameAxis" xlink:to="srt_RepurchaseAgreementCounterpartyNameDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LeaseContractualTermDomain" xlink:to="aspn_IndustrialRealEstateLeaseMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SupplyCommitmentAxis" xlink:to="us-gaap_SupplyCommitmentArrangementMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SupplyCommitmentAxis" xlink:to="us-gaap_SupplyCommitmentArrangementMember_default" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="aspn_SiliconValleyBankCreditFacilityMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplyCommitmentArrangementMember" xlink:to="aspn_CloudComputingAgreementMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="us-gaap_RevolvingCreditFacilityMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_DebtInstrumentTerm" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LeaseContractualTermAxis" xlink:to="us-gaap_LeaseContractualTermDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RepurchaseAgreementCounterpartyNameDomain" xlink:to="aspn_EnterpriseResourcePlanningSoftwareMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_CommitmentsAndContingenciesTable" xlink:to="srt_CounterpartyNameAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplyCommitmentArrangementMember" xlink:to="aspn_ThermalBarrierContractsMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_CapitalizedCostsRelatedToImplementationOfAgreement" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RepurchaseAgreementCounterpartyNameDomain" xlink:to="aspn_OEMMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_CommitmentsAndContingenciesTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplyCommitmentArrangementMember" xlink:to="aspn_SupplyAndJointDevelopmentAgreementAmendedMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_SignificantPurchaseCommitmentDescription" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RepurchaseAgreementCounterpartyNameDomain" xlink:to="aspn_BasfMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_CommitmentsAndContingenciesTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_SupplyAgreementExpirationDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RepurchaseAgreementCounterpartyNameDomain" xlink:to="aspn_LandlordMember" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="aspn_CommitmentsAndContingenciesTable" xlink:to="us-gaap_LeaseContractualTermAxis" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_CustomerAdvancesGross" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_CreditLimitPercentageOnPrepaymentBalance" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_ProceedsFromCustomerAdvances" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_Contractwithcustomerprepaymentliabilityrepayment" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_RestrictedCashCurrent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_LettersOfCreditOutstandingAmount" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_DebtInstrumentTerminationDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_NumberOfSquareFeetForLease" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_OperatingLeaseEndDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_OperatingLeaseBeginningDate" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_OperatingLeasesRentExpense" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_OperatingLeaseRentIncreasePercent" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_OperatingLeaseExtendedTerm" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_LeaseholdImprovementsGross" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_OperatingLeaseCost" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_LongTermPurchaseCommitmentAmount" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_InvestmentCompanyCommittedCapital" priority="2" use="optional"/>
<link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="aspn_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_LongtermPurchaseCommitmentPeriod" priority="2" use="optional"/>
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_TwoThousandFourteenEquityPlanMember" xlink:label="aspn_TwoThousandFourteenEquityPlanMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis"/>
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="us-gaap_RestrictedStockUnitsRSUMember"/>
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis"/>
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<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_OtherEmployeesMember" xlink:label="aspn_OtherEmployeesMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_EquityIncentivePlanMember" xlink:label="aspn_EquityIncentivePlanMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NonQualifiedStockOptionsMember" xlink:label="aspn_NonQualifiedStockOptionsMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ExecutiveMember" xlink:label="aspn_ExecutiveMember"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ServiceBasedAwardsMember" xlink:label="aspn_ServiceBasedAwardsMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NonEmployeeDirectorMember" xlink:label="aspn_NonEmployeeDirectorMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RestrictedStockAndRestrictedStockUnitsRsuMember" xlink:label="aspn_RestrictedStockAndRestrictedStockUnitsRsuMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember" xlink:label="aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_NumberOfOptionsWithModifiedVestingTerm" xlink:label="aspn_NumberOfOptionsWithModifiedVestingTerm"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_RestrictedStockAwardsMember" xlink:label="aspn_RestrictedStockAwardsMember"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
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<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance" xlink:label="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance"/>
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<link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredTaxAssetsGross" xlink:to="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" order="4" weight="1.00" use="optional"/>
<link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredTaxAssetsGross" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" order="5" weight="1.00" use="optional"/>
<link:calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="us-gaap_DeferredTaxAssetsGross" xlink:to="aspn_DeferredTaxAssetInterestExpenseLimitation" order="6" weight="1.00" use="optional"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DeferredTaxAssetsLiabilitiesGross" xlink:label="aspn_DeferredTaxAssetsLiabilitiesGross"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsGross" xlink:label="us-gaap_DeferredTaxAssetsGross"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="us-gaap_DeferredTaxLiabilities"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets" xlink:label="aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DeferredTaxAssetsOperatingLeaseLiabilities" xlink:label="aspn_DeferredTaxAssetsOperatingLeaseLiabilities"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment" xlink:label="aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards"/>
<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals"/>
<link:loc xlink:type="locator" xlink:href="aspn-20231231.xsd#aspn_DeferredTaxAssetInterestExpenseLimitation" xlink:label="aspn_DeferredTaxAssetInterestExpenseLimitation"/>
</link:calculationLink>
</link:linkbase>
</xsd:appinfo>
</xsd:annotation>
<xsd:element id="aspn_PeriodOfOptionToPurchase" name="PeriodOfOptionToPurchase" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_EquityIncentivePlanMember" name="EquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NonEmployeeDirectorsMember" name="NonEmployeeDirectorsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ProceedsFromIssuanceOfConvertibleNoteRelatedParty" name="ProceedsFromIssuanceOfConvertibleNoteRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_Contractwithcustomerprepaymentliabilityrepayment" name="Contractwithcustomerprepaymentliabilityrepayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CustomerAMember" name="CustomerAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_InternationalMember" name="InternationalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced" name="LesseeOperatingLeaseLiabilityPaymentsNotYetCommenced" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_ContractWithCustomerAssetAdditions" name="ContractWithCustomerAssetAdditions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OfficeSpace" name="OfficeSpace" type="dtr-types:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_RemittanceDateOfDeferredTaxBalanceRemainingPercentage" name="RemittanceDateOfDeferredTaxBalanceRemainingPercentage" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CommissionsAndFees" name="CommissionsAndFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_CommissionsAndFeesNet" name="CommissionsAndFeesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_NetOperatingLossesExpirationDescription" name="NetOperatingLossesExpirationDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_FundedAmountForOperations" name="FundedAmountForOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ScheduleOfBasisOfPresentationTable" name="ScheduleOfBasisOfPresentationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_EmployeeRetentionCreditsReceivable" name="EmployeeRetentionCreditsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_KochStrategicPlatformsLLCMember" name="KochStrategicPlatformsLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NatureOfBusinessPolicyTextBlock" name="NatureOfBusinessPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_PaymentsOfFeesAndIssuanceCostsFromPrivatePlacementOfCommonStock" name="PaymentsOfFeesAndIssuanceCostsFromPrivatePlacementOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_LandlordMember" name="LandlordMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_SubseaProjectsMember" name="SubseaProjectsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_EnergyIndustrialMember" name="EnergyIndustrialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_BasisOfPresentationLineItems" name="BasisOfPresentationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CreditsAgainstAmountsInvoicedOnPrepaymentLiability" name="CreditsAgainstAmountsInvoicedOnPrepaymentLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CommonStockIssuanceOfferingExpenses" name="CommonStockIssuanceOfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OperatingLeaseRentIncreasePercent" name="OperatingLeaseRentIncreasePercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CommonStockPerCapitalizedPrincipal" name="CommonStockPerCapitalizedPrincipal" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_AmendedAndRestatedLoanAndSecurityAgreementMember" name="AmendedAndRestatedLoanAndSecurityAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ContractualInterestPaymentInKind" name="ContractualInterestPaymentInKind" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_IncreaseDecreaseInOperatingLeaseRightOfUseAssets" name="IncreaseDecreaseInOperatingLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ContractWithCustomerAssetDeductions" name="ContractWithCustomerAssetDeductions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_FeesAndIssuanceCosts" name="FeesAndIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_ConvertibleNotesAbstract" name="ConvertibleNotesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_Rule10B51ArrModifiedFlag" name="Rule10B51ArrModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExpiredWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExpiredWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ChiefExecutiveOfficerAndCertainOtherEmployeesMember" name="ChiefExecutiveOfficerAndCertainOtherEmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_AccelerationOfUnamortizedStockBasedCompensationCharges" name="AccelerationOfUnamortizedStockBasedCompensationCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_FeesAndIssuanceCostsFromRegisteredDirectOfferingOfCommonStock" name="FeesAndIssuanceCostsFromRegisteredDirectOfferingOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_NonEmployeeDirectorMember" name="NonEmployeeDirectorMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CommonStockIssuanceFeesAndOfferingExpenses" name="CommonStockIssuanceFeesAndOfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_AllowancesForUncollectibleAccountsAndSalesReturnsAndAllowancesMember" name="AllowancesForUncollectibleAccountsAndSalesReturnsAndAllowancesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedOrExpectedToVestWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedOrExpectedToVestWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_SpringCreekCapitalLlcMember" name="SpringCreekCapitalLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CustomerOneMember" name="CustomerOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ConvertibleNotesTable" name="ConvertibleNotesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceAndAdditionalDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_EVThermalBarrierMember" name="EVThermalBarrierMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_SupplyAgreementExpirationDate" name="SupplyAgreementExpirationDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_DiscountOnConvertibleDebt" name="DiscountOnConvertibleDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets" name="DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CustomerBMember" name="CustomerBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ScheduleOfPrepaymentLiabilityTableTextBlock" name="ScheduleOfPrepaymentLiabilityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_NonQualifiedStockOptionsMember" name="NonQualifiedStockOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RemittanceDateOfDeferredTaxBalance" name="RemittanceDateOfDeferredTaxBalance" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_OtherEmployeesMember" name="OtherEmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_AmortizationOfDebtDiscountDueToModificationOfConvertibleNoteRelatedParty" name="AmortizationOfDebtDiscountDueToModificationOfConvertibleNoteRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_AllOtherCorporateAssetsMember" name="AllOtherCorporateAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_DeferredTaxAssetsCapitalizedResearchAndDevelopment" name="DeferredTaxAssetsCapitalizedResearchAndDevelopment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_DeferredTaxAssetsOperatingLeaseLiabilities" name="DeferredTaxAssetsOperatingLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExercisedWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOptionsExercisedWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_NumberOfCustomer" name="NumberOfCustomer" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_InitialConversionRateOfConvertibleNotes" name="InitialConversionRateOfConvertibleNotes" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_RevenueRecognitionTable" name="RevenueRecognitionTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ConversionNotesEffectiveConversionPricePerShare" name="ConversionNotesEffectiveConversionPricePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_SiliconValleyBankCreditFacilityMember" name="SiliconValleyBankCreditFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_IncreaseInDebtDiscountDueToModificationOfConvertibleNoteRelatedParty" name="IncreaseInDebtDiscountDueToModificationOfConvertibleNoteRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_AtTheMarketOfferingsMember" name="AtTheMarketOfferingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuedOrReservedForIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_OperatingLeaseEndDate" name="OperatingLeaseEndDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_LoanAgreementMember" name="LoanAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RobertMGervisMember" name="RobertMGervisMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ConvertibleNotesRelatedPartyTextBlock" name="ConvertibleNotesRelatedPartyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_PurchasePriceOfNotesPercentage" name="PurchasePriceOfNotesPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ConvertibleDebtNoncurrentRelatedParty" name="ConvertibleDebtNoncurrentRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CloudComputingCostsIncludedInOtherCurrentAssets" name="CloudComputingCostsIncludedInOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ContractWithCustomerPrepaymentLiabilityRepayment" name="ContractWithCustomerPrepaymentLiabilityRepayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_StandardProductWarrantyPeriod" name="StandardProductWarrantyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CommonStockOptionsMember" name="CommonStockOptionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_AmortizationOfCloudComputingCosts" name="AmortizationOfCloudComputingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_ScheduleOfCapitalizedImplementationCostsTableTextBlock" name="ScheduleOfCapitalizedImplementationCostsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_AccretionOfInterestOnConvertibleNoteRelatedParty" name="AccretionOfInterestOnConvertibleNoteRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_TwoThousandAndTwentyTwoConvertibleNotesMember" name="TwoThousandAndTwentyTwoConvertibleNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RestrictedStockAndRestrictedStockUnitsRsuMember" name="RestrictedStockAndRestrictedStockUnitsRsuMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ShippingAndHandlingCostsClassifiedAsComponentOfCostOfRevenuePolicyPolicyTextBlock" name="ShippingAndHandlingCostsClassifiedAsComponentOfCostOfRevenuePolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_PaymentInKind" name="PaymentInKind" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_ThermalBarrierMember" name="ThermalBarrierMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NumberOfOptionsWithModifiedVestingTerm" name="NumberOfOptionsWithModifiedVestingTerm" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionAggregateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_PrepaymentLiabilityMember" name="PrepaymentLiabilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ThermalBarrierContractsMember" name="ThermalBarrierContractsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NumberOfTradingDays" name="NumberOfTradingDays" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_TotalCapitalizedCloudComputingCosts" name="TotalCapitalizedCloudComputingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_NumberOfSubsidiaries" name="NumberOfSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpiredInPeriodIntrinsicValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_BasfMember" name="BasfMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_SiliconValleyBankUkLimitedMember" name="SiliconValleyBankUkLimitedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_DebtInstrumentTerminationDate" name="DebtInstrumentTerminationDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_OperatingLeaseBeginningDate" name="OperatingLeaseBeginningDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CaresActRefundableTaxCreditPercentage" name="CaresActRefundableTaxCreditPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_InterestIncomeExpenseRelatedParty" name="InterestIncomeExpenseRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_SupplyAgreementMember" name="SupplyAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_IndustrialRealEstateLeaseMember" name="IndustrialRealEstateLeaseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_IncreaseDecreaseInOperatingLeaseLiabilities" name="IncreaseDecreaseInOperatingLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OEMMember" name="OEMMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_LiquidityPolicyTextBlock" name="LiquidityPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_SiliconValleyBankMember" name="SiliconValleyBankMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CapitalizedResearchAndDevelopmentCostsAmortizationPeriod" name="CapitalizedResearchAndDevelopmentCostsAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ContractWithCustomerLiabilityDeductions" name="ContractWithCustomerLiabilityDeductions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OperatingLeasesRentExpense" name="OperatingLeasesRentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ProceedsFromCustomerAdvances" name="ProceedsFromCustomerAdvances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_AtMarketOfferingMember" name="AtMarketOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_PercentageOfClosingPricePerShareOfCommonStock" name="PercentageOfClosingPricePerShareOfCommonStock" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CaresActEmployeeRetentionCredit" name="CaresActEmployeeRetentionCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_DeferredTaxAssetInterestExpenseLimitation" name="DeferredTaxAssetInterestExpenseLimitation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_CaresActRefundableTaxCredit" name="CaresActRefundableTaxCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_GeneralMotorsHoldingsLlcMember" name="GeneralMotorsHoldingsLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_LineOfCreditFacilityIncreasedMaximumBorrowingCapacity" name="LineOfCreditFacilityIncreasedMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_UnderwritingDiscountAndCommission" name="UnderwritingDiscountAndCommission" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_EffectiveIncomeTaxRateReconciliationDeductibleExpenseShareBasedCompensationCost" name="EffectiveIncomeTaxRateReconciliationDeductibleExpenseShareBasedCompensationCost" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_KochDisruptiveTechnologiesLlcMember" name="KochDisruptiveTechnologiesLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_UnderwrittenPublicOfferingMember" name="UnderwrittenPublicOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RemainingPercentageOfDeferredTaxBalance" name="RemainingPercentageOfDeferredTaxBalance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ExecutiveMember" name="ExecutiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_SalesReturnReserve" name="SalesReturnReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CreditLimitPercentageOnPrepaymentBalance" name="CreditLimitPercentageOnPrepaymentBalance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_PotentialImpactOfReimbursementFromCustomer" name="PotentialImpactOfReimbursementFromCustomer" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OperatingLeaseExtendedTerm" name="OperatingLeaseExtendedTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_ConvertibleNoteIfConvertedMember" name="ConvertibleNoteIfConvertedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RevolvingLineOfCreditTextBlock" name="RevolvingLineOfCreditTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" name="PrepaidExpensesAndOtherCurrentAssetsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CARESActMember" name="CARESActMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_IncomeFromEmployeeRetentionCredits" name="IncomeFromEmployeeRetentionCredits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_ContractWithCustomerLiabilityAdditions" name="ContractWithCustomerLiabilityAdditions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_ConvertibleDebtPrincipalAmount" name="ConvertibleDebtPrincipalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_SupplyAndJointDevelopmentAgreementAmendedMember" name="SupplyAndJointDevelopmentAgreementAmendedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_OtherAssetsPolicyTextBlock" name="OtherAssetsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_UnlimitedCarryForwardMember" name="UnlimitedCarryForwardMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NumberOfPerformanceObligations" name="NumberOfPerformanceObligations" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RestrictedCashPolicyTextBlock" name="RestrictedCashPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ConversionNotesEffectiveConversionPricePerShareDecrease" name="ConversionNotesEffectiveConversionPricePerShareDecrease" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_NonRule10B51ArrModifiedFlag" name="NonRule10B51ArrModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ConvertibleNotesLineItems" name="ConvertibleNotesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_IssuanceCostsFromUnderwrittenPublicOffering" name="IssuanceCostsFromUnderwrittenPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ConvertibleDebtAmortizedCost" name="ConvertibleDebtAmortizedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_CustomerAdvancesGross" name="CustomerAdvancesGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CapitalizedCostsRelatedToImplementationOfAgreement" name="CapitalizedCostsRelatedToImplementationOfAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_PercentageOfDeferredTaxBalance" name="PercentageOfDeferredTaxBalance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_CapitalizedResearchAndDovelopmentExpense" name="CapitalizedResearchAndDovelopmentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_DescriptionOfBusinessAbstract" name="DescriptionOfBusinessAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_WoodRiverCapitalLLCMember" name="WoodRiverCapitalLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnReserve" name="AllowanceForDoubtfulAccountsReceivableAndSalesReturnReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CustomerTwoMember" name="CustomerTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CloudComputingCostsIncludedInOtherAssets" name="CloudComputingCostsIncludedInOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_ComputerEquipmentAndSoftwareMember" name="ComputerEquipmentAndSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RegulatoryAssetsAbstract" name="RegulatoryAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_CaresActQualifiedWagesPerEmployeeForRefundableTaxCredit" name="CaresActQualifiedWagesPerEmployeeForRefundableTaxCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_OperatingLeaseExpiryYear" name="OperatingLeaseExpiryYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_EmployeeRetentionCreditsPolicyTextBlock" name="EmployeeRetentionCreditsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_ServiceBasedAwardsMember" name="ServiceBasedAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_TwentyTwentyThreeEquityPlanMember" name="TwentyTwentyThreeEquityPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_RestrictedStockAwardsMember" name="RestrictedStockAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_UnderwritingDiscountsAndCommissionsNet" name="UnderwritingDiscountsAndCommissionsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_TwoThousandFourteenEquityPlanMember" name="TwoThousandFourteenEquityPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_NumberOfSquareFeetForLease" name="NumberOfSquareFeetForLease" type="dtr-types:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
<xsd:element id="aspn_RevenueRecognitionLineItems" name="RevenueRecognitionLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_AmountsReceivableForLeasedPremisesConstructionImprovements" name="AmountsReceivableForLeasedPremisesConstructionImprovements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_PreConstructionCosts" name="PreConstructionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_RegisteredDirectOfferingMember" name="RegisteredDirectOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_DeferredTaxAssetsLiabilitiesGross" name="DeferredTaxAssetsLiabilitiesGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
<xsd:element id="aspn_EnterpriseResourcePlanningSoftwareMember" name="EnterpriseResourcePlanningSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_FairValueOfDebtConversionOptionIncreased" name="FairValueOfDebtConversionOptionIncreased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
<xsd:element id="aspn_CloudComputingAgreementMember" name="CloudComputingAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
<xsd:element id="aspn_EmployerPayrollTaxObligationPeriod" name="EmployerPayrollTaxObligationPeriod" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
<xsd:element id="aspn_SharesAuthorized" name="SharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
</xsd:schema>


1 Subsequent Filing that References this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 5/02/24  Aspen Aerogels Inc.               S-3                    4:272K                                   Donnelley … Solutions/FA


19 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

12/20/23  Aspen Aerogels Inc.               8-K:1,8,9  12/19/23   13:328K                                   Donnelley … Solutions/FA
11/02/23  Aspen Aerogels Inc.               10-Q        9/30/23   78:12M                                    Donnelley … Solutions/FA
 6/01/23  Aspen Aerogels Inc.               8-K:5,9     6/01/23   16:835K                                   Donnelley … Solutions/FA
 3/16/23  Aspen Aerogels Inc.               10-K       12/31/22  101:18M                                    Donnelley … Solutions/FA
11/29/22  Aspen Aerogels Inc.               8-K:1,2,9  11/28/22   13:541K                                   Donnelley … Solutions/FA
 8/04/22  Aspen Aerogels Inc.               10-Q        6/30/22   76:10M                                    ActiveDisclosure/FA
 5/10/22  Aspen Aerogels Inc.               10-Q        3/31/22   84:11M                                    ActiveDisclosure/FA
 3/01/22  Aspen Aerogels Inc.               10-K       12/31/21   98:14M                                    ActiveDisclosure/FA
 2/17/22  Aspen Aerogels Inc.               8-K:1,2,3,8 2/15/22   14:1.3M                                   Donnelley … Solutions/FA
 8/04/21  Aspen Aerogels Inc.               10-Q        6/30/21   72:9.2M                                   ActiveDisclosure/FA
 6/30/21  Aspen Aerogels Inc.               8-K:1,3,5,8 6/29/21   12:419K                                   ActiveDisclosure/FA
 5/04/21  Aspen Aerogels Inc.               10-Q        3/31/21   72:7.2M                                   ActiveDisclosure/FA
 3/06/20  Aspen Aerogels Inc.               10-K       12/31/19   88:12M                                    ActiveDisclosure/FA
 3/02/17  Aspen Aerogels Inc.               10-K       12/31/16   83:10M                                    ActiveDisclosure/FA
11/07/14  Aspen Aerogels Inc.               10-Q        9/23/14   71:4.9M                                   Donnelley … Solutions/FA
 8/13/14  Aspen Aerogels Inc.               S-8         8/13/14    4:211K                                   Donnelley … Solutions/FA
 6/19/14  Aspen Aerogels Inc.               8-K:5,8,9   6/18/14    5:157K                                   Donnelley … Solutions/FA
 5/14/14  Aspen Aerogels Inc.               S-1/A                 11:1.4M                                   Donnelley … Solutions/FA
 4/28/14  Aspen Aerogels Inc.               S-1¶                  36:6.8M                                   Donnelley … Solutions/FA
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