﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2023v5.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-11-12T18:43:31-06:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>991856619</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>GRANT THORNTON ADVISORS LLC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>2001 MARKET STREET SUITE 700</AddressLine1Txt>
        <CityNm>PHILADELPHIA</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>19103</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>541170360</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>SAFETY EQUIPMENT INSTITUTE</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>SAFE</BusinessNameControlTxt>
      <PhoneNum>7034425732</PhoneNum>
      <USAddress>
        <AddressLine1Txt>100 BARR HARBOR DRIVE</AddressLine1Txt>
        <CityNm>WEST CONSHOHOCKEN</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>194282959</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>TIMOTHY BROOKE</PersonNm>
      <PersonTitleTxt>PRESIDENT</PersonTitleTxt>
      <PhoneNum>7034425732</PhoneNum>
      <SignatureDt>2024-11-11</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>1</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>RUSSLEE ARMSTRONG</PreparerPersonNm>
      <PTIN>P00288383</PTIN>
      <PhoneNum>2155614200</PhoneNum>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2024-10-15 13:58:12Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="6">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <AddressChangeInd>X</AddressChangeInd>
      <PrincipalOfficerNm>TIMOTHY BROOKE</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>100 BARR HARBOR DRIVE</AddressLine1Txt>
        <CityNm>WEST CONSHOHOCKEN</CityNm>
        <StateAbbreviationCd>PA</StateAbbreviationCd>
        <ZIPCd>194282959</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>4397821</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>WWW.SEINET.ORG</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1980</FormationYr>
      <LegalDomicileStateCd>VA</LegalDomicileStateCd>
      <ActivityOrMissionDesc>SEI ADMINISTERS A TESTING AND CERTIFICATION PROGRAM FOR SAFE LIVING AND WORKING ENVIRONMENTS.</ActivityOrMissionDesc>
      <VotingMembersGoverningBodyCnt>5</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>5</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <TotalVolunteersCnt>5</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>0</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>0</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>5467567</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>4172288</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>14320</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>13704</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>0</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>0</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>5481887</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>4185992</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>0</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>0</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>1227716</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>1198100</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>0</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>0</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>3996587</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>2814820</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>5224303</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>4012920</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>257584</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>173072</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>4261026</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>2774940</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>2696868</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>928181</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>1564158</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>1846759</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIIInd>X</InfoInScheduleOPartIIIInd>
      <MissionDesc>THE ORGANIZATION ADMINISTERS AN AUDITING, TESTING AND CERTIFICATION PROGRAM FOR SAFE LIVING AND WORKING ENVIRONMENTS.(SEE SCHEDULE O)THE PROGRAM'S PURPOSE IS TO ASSIST INDUSTRY AND GOVERNMENT AGENCIES IN MEETING THEIR MUTUAL GOALS OF PROVIDING WORKERS AND CONSUMERS THE BEST POSSIBLE PRODUCTS AND ENVIRONMENT THROUGH TESTING FOR PUBLIC SAFETY IN KEEPING WITH RECOGNIZED STANDARDS AND THE CURRENT STATE OF THE ART, AND FOR PUBLIC BENEFIT TO RECOGNIZE AND DISSEMINATE INFORMATION ON THOSE PRODUCTS WHICH ARE CERTIFIED TO MEET THE APPLICABLE STANDARDS.</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>3829630</ExpenseAmt>
      <GrantAmt>0</GrantAmt>
      <RevenueAmt>4172288</RevenueAmt>
      <Desc>SAFETY EQUIPMENT INSTITUTE'S PROGRAM ACCOMPLISHMENT IS CONSISTENT WITH THE ORGANIZATION'S PURPOSE AND MISSION. THE ORGANIZATION'S PRIMARY PROGRAM ACCOMPLISHMENT IS TO DETERMINE COMPLIANCE OF PRODUCTS AND SYSTEMS WITH NATIONALLY AND INTERNATIONALLY RECOGNIZED PUBLIC SAFETY STANDARDS THROUGH THE ADMINISTRATION OF A TESTING AND CERTIFICATION PROGRAM TO ASSURE THE CONTINUED SAFETY OF THE GENERAL PUBLIC AND THOSE WHO USE CERTIFIED PRODUCTS. WE ACCOMPLISH THIS THROUGH REVIEWING THE DRAWINGS AND DESIGNS OF THE PRODUCTS, PERFORMING QUALITY AUDITS OF THE MANUFACTURING FACILITIES, AND ENSURING THE TESTING LABORATORIES USED TO CONDUCT THE TESTING ARE ACCREDITED TO ISO 17025.</Desc>
      <TotalProgramServiceExpensesAmt>3829630</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd>0</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd referenceDocumentId="RetDoc1040000001">0</DonorAdvisedFundInd>
      <ConservationEasementsInd referenceDocumentId="RetDoc1040000001">0</ConservationEasementsInd>
      <CollectionsOfArtInd referenceDocumentId="RetDoc1040000001">0</CollectionsOfArtInd>
      <CreditCounselingInd referenceDocumentId="RetDoc1040000001">0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd referenceDocumentId="RetDoc1040000001">1</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd referenceDocumentId="RetDoc1040000001">0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd referenceDocumentId="RetDoc1040000001">0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd referenceDocumentId="RetDoc1040000001">0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd referenceDocumentId="RetDoc1040000001">1</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd referenceDocumentId="RetDoc1040000001">1</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">0</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd referenceDocumentId="RetDoc1040000001">1</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd>0</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd>0</FundraisingActivitiesInd>
      <GamingActivitiesInd>0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd>0</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd>0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd referenceDocumentId="RetDoc1042400001">1</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd>0</TerminateOperationsInd>
      <PartialLiquidationInd>0</PartialLiquidationInd>
      <DisregardedEntityInd referenceDocumentId="RetDoc1043400001">0</DisregardedEntityInd>
      <RelatedEntityInd referenceDocumentId="RetDoc1043400001">1</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd referenceDocumentId="RetDoc1043400001">0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd referenceDocumentId="RetDoc1043400001">0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <InfoInScheduleOPartVInd>X</InfoInScheduleOPartVInd>
      <IRPDocumentCnt>6</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <BackupWthldComplianceInd>1</BackupWthldComplianceInd>
      <EmployeeCnt>0</EmployeeCnt>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>5</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>5</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>0</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>1</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>1</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>1</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>0</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>1</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>1</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>1</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>1</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>1</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>1</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>0</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>0</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <PersonNm>HEIDI TURLEY TREASURER</PersonNm>
        <PhoneNum>6108329540</PhoneNum>
        <USAddress>
          <AddressLine1Txt>100 BARR HARBOR DRIVE</AddressLine1Txt>
          <CityNm>CONSHOHOCKEN</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19428</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>KAREN LEHTONEN</PersonNm>
        <TitleTxt>CHAIR OF THE BOARD</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>IRVING SCHER PHD PE</PersonNm>
        <TitleTxt>VICE CHAIR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PATRICK J MORRISON</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>BRADLEY M SANT</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JEFFERY W VINCOLI</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>HEIDI TURLEY</PersonNm>
        <TitleTxt>TREASURER (ASTM: VP FINANCE &amp; ADMIN)</TitleTxt>
        <AverageHoursPerWeekRt>2.50</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>37.50</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>339858</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>93820</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>TIMOTHY BROOKE</PersonNm>
        <TitleTxt>PRESIDENT (ASTM: VP LAB SVCS &amp; CERT)</TitleTxt>
        <AverageHoursPerWeekRt>10.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>30.00</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>342264</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>220349</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>STEPHEN SANDERS</PersonNm>
        <TitleTxt>TECHNICAL DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>172774</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>51081</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM FITHIAN</PersonNm>
        <TitleTxt>TECHNICAL DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>134428</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>76830</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>0</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>989324</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>442080</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
      <ProgramServiceRevenueGrp>
        <Desc>SURCHARGE-AUDIT &amp; TEST</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>2683837</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2683837</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>CERTIFICATION FEES</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>778090</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>778090</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PARTICIPATION FEES</Desc>
        <BusinessCd>541380</BusinessCd>
        <TotalRevenueColumnAmt>689626</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>689626</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>APPLICATION FEES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>20585</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>20585</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PRODUCT REVIEW FEES</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>150</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>150</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>4172288</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>32719</TotalRevenueColumnAmt>
        <ExclusionAmt>32719</ExclusionAmt>
      </InvestmentIncomeGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>192814</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>211829</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>-19015</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>-19015</TotalRevenueColumnAmt>
        <ExclusionAmt>-19015</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>4185992</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>4172288</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>13704</ExclusionAmt>
      </TotalRevenueGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>49815</TotalAmt>
        <ProgramServicesAmt>43459</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6356</ManagementAndGeneralAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>851839</TotalAmt>
        <ProgramServicesAmt>743144</ProgramServicesAmt>
        <ManagementAndGeneralAmt>108695</ManagementAndGeneralAmt>
      </OtherSalariesAndWagesGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>228551</TotalAmt>
        <ProgramServicesAmt>199388</ProgramServicesAmt>
        <ManagementAndGeneralAmt>29163</ManagementAndGeneralAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>67895</TotalAmt>
        <ProgramServicesAmt>59232</ProgramServicesAmt>
        <ManagementAndGeneralAmt>8663</ManagementAndGeneralAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>2112</TotalAmt>
        <ProgramServicesAmt>1843</ProgramServicesAmt>
        <ManagementAndGeneralAmt>269</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>5079</TotalAmt>
        <ProgramServicesAmt>4431</ProgramServicesAmt>
        <ManagementAndGeneralAmt>648</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>61793</TotalAmt>
        <ProgramServicesAmt>53908</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7885</ManagementAndGeneralAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>17121</TotalAmt>
        <ProgramServicesAmt>14936</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2185</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>38675</TotalAmt>
        <ProgramServicesAmt>33740</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4935</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>52048</TotalAmt>
        <ProgramServicesAmt>45407</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6641</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>17839</TotalAmt>
        <ProgramServicesAmt>15563</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2276</ManagementAndGeneralAmt>
      </TravelGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>800</TotalAmt>
        <ProgramServicesAmt>698</ProgramServicesAmt>
        <ManagementAndGeneralAmt>102</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>30748</TotalAmt>
        <ProgramServicesAmt>30748</ProgramServicesAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>TESTING LAB AND PRODUCT</Desc>
        <TotalAmt>2557006</TotalAmt>
        <ProgramServicesAmt>2555873</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1133</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>ACCREDITATION</Desc>
        <TotalAmt>27123</TotalAmt>
        <ProgramServicesAmt>23662</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3461</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>DUES AND SUBSCRIPTIONS</Desc>
        <TotalAmt>4124</TotalAmt>
        <ProgramServicesAmt>3598</ProgramServicesAmt>
        <ManagementAndGeneralAmt>526</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>TAXES</Desc>
        <TotalAmt>352</TotalAmt>
        <ManagementAndGeneralAmt>352</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>4012920</TotalAmt>
        <ProgramServicesAmt>3829630</ProgramServicesAmt>
        <ManagementAndGeneralAmt>183290</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>2085983</BOYAmt>
        <EOYAmt>892837</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>4662</BOYAmt>
        <EOYAmt>6236</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <AccountsReceivableGrp>
        <BOYAmt>1346407</BOYAmt>
        <EOYAmt>702896</EOYAmt>
      </AccountsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>5366</BOYAmt>
        <EOYAmt>5366</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>11400</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>11396</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>804</BOYAmt>
        <EOYAmt>4</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>765945</BOYAmt>
        <EOYAmt>1167601</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>51859</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>4261026</BOYAmt>
        <EOYAmt>2774940</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>1372698</BOYAmt>
        <EOYAmt>363568</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>63100</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </DeferredRevenueGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>1261070</BOYAmt>
        <EOYAmt>564613</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>2696868</BOYAmt>
        <EOYAmt>928181</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1564158</BOYAmt>
        <EOYAmt>1846759</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>1564158</BOYAmt>
        <EOYAmt>1846759</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>4261026</BOYAmt>
        <EOYAmt>2774940</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>173072</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>109529</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <TestPublicSafetyInd>X</TestPublicSafetyInd>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>11400</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>11396</DepreciationAmt>
        <BookValueAmt>4</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>4</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DUE TO ASTM</Desc>
        <Amt>564613</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>564613</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>4295521</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>109529</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>109529</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>4185992</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4185992</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4012920</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4012920</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>4012920</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SEI IS A FEDERAL TAX EXEMPT ORGANIZATION UNDER IRC 501(C)(3). THE ORGANIZATION IS INCLUDED IN THE CONSOLIDATED FINANCIAL STATEMENTS OF ASTM (SOCIETY). THE RELEVANT TEXT FROM THE FINANCIAL STATEMENT AUDIT FOOTNOTE READS: MANAGEMENT HAS ANALYZED THE TAX POSITIONS TAKEN BY THE SOCIETY AND HAS CONCLUDED THAT AS OF DECEMBER 31, 2023 AND 2022, THERE ARE NO UNCERTAIN POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>1</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>TIMOTHY BROOKE</PersonNm>
        <TitleTxt>PRESIDENT (ASTM: VP LAB SVCS &amp; CERT)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>307363</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>32964</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>1937</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>180510</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>39839</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>562613</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>HEIDI TURLEY</PersonNm>
        <TitleTxt>TREASURER (ASTM: VP FINANCE &amp; ADMIN)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>305047</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>32721</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2090</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>53981</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>39839</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>433678</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>STEPHEN SANDERS</PersonNm>
        <TitleTxt>TECHNICAL DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>159430</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>11957</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>1387</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>50073</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>1008</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>223855</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WILLIAM FITHIAN</PersonNm>
        <TitleTxt>TECHNICAL DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>123102</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>9679</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>1647</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>51301</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>25529</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>211258</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FILING ORGANIZATION DOES NOT COMPENSATE THE ORGANIZATION'S CEO/EXECUTIVE DIRECTOR (REFERRED TO AS PRESIDENT; ADDITIONALLY A VP AT ASTM); SUCH INDIVIDUAL IS COMPENSATED BY A RELATED ORGANIZATION. THE PROCESS TO ESTABLISH THE COMPENSATION OF THE FILING ORGANIZATION'S PRESIDENT, BY THE RELATED ORGANIZATION FOR HIS STAFF POSITION, USES THE FOLLOWING METHODS: COMPENSATION COMMITTEE, INDEPENDENT COMPENSATION CONSULTANT, COMPENSATION SURVEY OR STUDY, AND APPROVAL BY THE COMPENSATION COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>SEI DOES NOT HAVE ANY EMPLOYEES; CERTAIN INDIVIDUALS LISTED IN FORM 990, PART VII PARTICIPATE IN A RELATED ORGANIZATION'S SPLIT DOLLAR ARRANGEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 7:</FormAndLineReferenceDesc>
        <ExplanationTxt>NON-FIXED PAYMENTS SEI DOES NOT HAVE PAID EMPLOYEES. THE RELATED ORGANIZATION, ASTM, PROVIDES THE OPPORTUNITY FOR CERTAIN NON-FIXED PAYMENTS TO EMPLOYEES, DESCRIBED AS FOLLOWS. THE EXECUTIVE COMMITTEE OF THE BOARD MAY SET CERTAIN ANNUAL NON-FINANCIAL GOALS FOR ASTM. IF THOSE GOALS ARE MET, THEN AN INCENTIVE IS PAID. NO INCENTIVE OR OTHER NON-FIXED PAYMENTS ARE CONTINGENT UPON THE FINANCIAL PERFORMANCE OF ASTM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II, COL (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL SEI EMPLOYEES ARE EMPLOYEES OF ASTM AND ARE ASSIGNED TO PERFORM THE OPERATIONS OF SEI.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II, COL (B), LINE (1):</FormAndLineReferenceDesc>
        <ExplanationTxt>TIMOTHY BROOKE'S AND HEIDI TURLEY'S REPORTABLE COMPENSATION IN COL (E) ARE THEIR ENTIRE COMPENSATION EARNED DURING 2023, INCLUDING TIME AS VICE-PRESIDENT OF LABORATORY SERVICES AND VICE-PRESIDENT OF FINANCE AND ADMIN, RESPECTIVELY, FOR ASTM. THEIR 2023 COMPENSATION INCLUDES WORK PERFORMED FOR BOTH ASTM AND SEI DURING 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II, COL (C):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 REQUIRES REPORTING AS DEFERRED COMPENSATION THE ANNUAL INCREASE OR DECREASE IN ACTUARIAL VALUE, IF ANY, OF A DEFINED BENEFIT PLAN. THE TAX YEAR 2023 DECREASE IS REFLECTED IN COLUMN C. ALSO INCLUDED IN PART II, COLUMN C, IS EMPLOYER CONTRIBUTIONS TO THE DEFINED CONTRIBUTION (403(B)) PLAN.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART V, LINE 2A AND B:</FormAndLineReferenceDesc>
        <ExplanationTxt>SEI DOES NOT HAVE EMPLOYEES. ASTM EMPLOYS INDIVIDUALS THAT ARE ASSIGNED TO PERFORM THE OPERATIONS OF SEI. FOR 2023, THERE WERE 9 INDIVIDUALS ASSIGNED TO SEI. THE COMPENSATION AND BENEFITS CHARGED TO SEI BY ASTM ARE REPORTED ON PART IX STATEMENT OF FUNCTIONAL EXPENSES LINES 5 AND 7-10.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>AMERICAN SOCIETY FOR TESTING AND MATERIALS A.K.A. ASTM IS THE SOLE MEMBER OF SEI.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTM IS THE SOLE MEMBER OF SEI AND APPOINTS THE BOARD OF DIRECTORS OF SEI.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL GOVERNANCE ACTIONS OF THE SEI BOARD ARE SUBJECT TO REVIEW AND APPROVAL BY THE ASTM BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD REVIEWS THE FORM 990 PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SEI REGULARLY AND CONSISTENTLY MONITORS AND ENFORCES COMPLIANCE WITH ITS QUALITY AND OPERATIONAL PROCEDURES MANUAL APPENDIX 20.4.1. CONFLICTS OF INTEREST SECTION FOR OFFICERS, DIRECTORS, AND KEY EMPLOYEES. THE POLICY DEFINES CONFLICTS OF INTEREST, IDENTIFIES THE CLASSES OF INDIVIDUALS WITHIN THE ORGANIZATION COVERED BY THE POLICY, AND SPECIFIES PROCEDURES TO FOLLOW IN MANAGING CONFLICTS OF INTEREST. ON AN ANNUAL BASIS, ALL OFFICERS, DIRECTORS, AND KEY EMPLOYEES CERTIFY THAT THEY HAVE READ AND WILL CONTINUE TO FOLLOW THE BOARD PROCEDURES AND SIGN THE PROCEDURE MANUAL FORM DISCLOSING THEIR POTENTIAL CONFLICTS. ANY INFORMATION OF A POSSIBILITY OF A CONFLICT OF INTEREST SHALL PROMPTLY BE REPORTED TO THE PRESIDENT AND/OR THE CHAIRMAN OF THE SEI COMMITTEE ON CERTIFICATION PROGRAMS (CCP). THE PRESIDENT AND/OR THE CHAIRMAN OF THE SEI CCP SHALL AS PROMPTLY AS POSSIBLE, EMPLOY ALL POSSIBLE MEANS TO PREVENT OR OVERCOME ANY SUCH ACTIONS THAT MAY CONCEIVABLY BE IN VIOLATION OF THIS POLICY. THESE AND OTHER REQUIREMENTS ARE MONITORED, REVIEWED AND RESOLVED ON AN ONGOING BASIS PURSUANT TO THE QUALIFY AND OPERTIONAL PROCEDURES MANUAL APPENDIX 20.4.1.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>SEI DOES NOT HAVE ANY PAID EMPLOYEES; ALL COMPENSATION TO OFFICERS REPORTED ON PART VII OF THE FORM 990 WAS PAID BY A RELATED ORGANIZATION, ASTM. THE PROCESS USED TO DETERMINE COMPENSATION FOR THOSE INDIVIDUALS IS AS FOLLOWS: THE EXECUTIVE COMMITTEE IS RESPONSIBLE FOR ADMINISTERING THE OFFICERS' EMPLOYMENT AGREEMENT AND COMPENSATION PROGRAM. THE FINANCE AND AUDIT COMMITTEE IS RESPONSIBLE FOR MONITORING EMPLOYEE BENEFITS AND SALARY ADMINISTRATION PROGRAMS AND FOR MAKING RECOMMENDATIONS TO THE BOARD OF DIRECTORS FOR SUCH MODIFICATIONS AS MAY BE NECESSARY. TO THAT END, THE EXECUTIVE COMMITTEE OF THE BOARD OF DIRECTORS IS AUTHORIZED TO CONTRACT, NEGOTIATE AND SET THE SALARY AND BENEFITS PACKAGE OF THE PRESIDENT. THE PRACTICES AND THE PROCEDURES USED TO SET THE SALARY AND BENEFITS PACKAGE ARE AS FOLLOWS: - THESE OFFICERS' POSITIONS ARE BENCHMARKED PERIODICALLY BY A MAJOR BENEFIT CONSULTING FIRM IN THE UNITED STATES. (1/3 OF ALL POSITIONS ARE BENCHMARKED EVERY YEAR). THE REPORT FROM THE BENEFIT CONSULTING FIRM INCLUDES THE USE OF THE LATEST AVAILABLE DATA (E.G., SURVEY REPORTS) AS TO COMPARABLE COMPENSATION FOR THE SIZE OF THE ENTERPRISE (I.E., OTHER LARGE NONPROFIT MEMBERSHIP AND TRADE ASSOCIATIONS) AND ROLES AND RESPONSIBILITIES OF THE POSITIONS UNDER REVIEW. THE REPORT AND WRITTEN DOCUMENTATION OF DELIBERATIONS AND DECISIONS BY BOTH COMMITTEES IS RECORDED IN THE COMMITTEE MEETING MINUTES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICTS OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>SAFETY EQUIPMENT INSTITUTE IS AUDITED AS PART OF THE CONSOLIDATED FINANCIAL STATEMENTS OF ITS SOLE MEMBER, AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM). THE AUDIT COMMITTEE OF ASTM SELECTS THE INDEPENDENT ACCOUNTANT AND ASSUMES RESPONSIBILITY FOR OVERSIGHT OF THE AUDIT. THE CONSOLIDATED FINANCIAL STATEMENTS RECEIVED AN UNQUALIFIED AUDIT OPINION FOR THIS FISCAL YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR TESTING AND MATERIALS</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>100 BARR HARBOR DRIVE</AddressLine1Txt>
          <CityNm>WEST CONSHOHOCKEN</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19428</ZIPCd>
        </USAddress>
        <EIN>231352024</EIN>
        <PrimaryActivitiesTxt>STANDARDS FOR MATERIALS, PRODUCTS, SYSTEMS AND SERVICES.</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 10</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>TEST MONITORING CENTER</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>203 ARMSTRONG DRIVE</AddressLine1Txt>
          <CityNm>FREEPORT</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>16229</ZIPCd>
        </USAddress>
        <EIN>844963663</EIN>
        <PrimaryActivitiesTxt>MONITORING CENTER</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 11</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>ASTM</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>