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1、Designation:D2240–05StardTestMethodfRubberProperty—DurometerHardness1ThisstardisissuedunderthefixeddesignationD2240thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearofla

2、strevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon(e)indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmeth

3、odcoverstwelvetypesofrubberhardnessmeasurementdevicesknownasdurometers:TypesABCDDOEMOOOOOOOOOSR.Theprocedurefdeterminingindentationhardnessofsubstancesclassifiedasthermoplasticelastomersvulcanized(thermoset)rubberelastom

4、ericmaterialscellularmaterialsgellikematerialssomeplasticsisalsodescribed.1.2ThistestmethodisnotequivalenttootherindentationhardnessmethodsinstrumenttypesspecificallythosedescribedinTestMethodD1415.1.3Thistestmethodisnot

5、applicabletothetestingofcoatedfabrics.1.4AllmaterialsinstrumentsequipmentusedfthedeterminationofmassfcedimensionshallhavetraceabilitytotheNationalInstitutefStardsTechnologyotherinternationallyrecognizedganizationsparalle

6、linnature.1.5ThevaluesstatedinSIunitsaretoberegardedasstard.Thevaluesgiveninparenthesesarefinfmationonly.ManyofthestateddimensionsinSIaredirectconversionsfromtheU.S.CustomarySystemtoaccommodatetheinstrumentationpractices

7、proceduresthatexistedpritotheMetricConversionActof1975.1.6Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpractices

8、determinetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D374TestMethodsfThicknessofSolidElectricalInsulationD618PracticefConditioningPlasticsfTestingD785TestMethodfRockwellHardnessofPla

9、sticsElectricalInsulatingMaterialsD1349PracticefRubber—StardTemperaturesfTestingD1415TestMethodfRubberProperty—InternationalHardnessD4483PracticefDeterminingPrecisionfTestMethodStardsintheRubberCarbonBlackIndustriesF1957

10、TestMethodfCompositeFoamHardnessDurometerHardness2.2ISOStard:3ISOIEC17025:1999GeneralRequirementsftheCompetenceofTestingCalibrationLabaties3.SummaryofTestMethod3.1Thistestmethodpermitshardnessmeasurementsbasedoneitherini

11、tialindentationindentationafteraspecifiedperiodoftimeboth.Durometerswithmaximumreadingindicatsusedtodeterminemaximumhardnessvaluesofamaterialmayyieldlowerhardnesswhenthemaximumindicatisused.3.2TheproceduresfTypeMmicrohar

12、dnessdurometersaccommodatespecimensthatarebytheirdimensionsconfigurationdinarilyunabletohavetheirdurometerhardnessdeterminedbytheotherdurometertypesdescribed.TypeMdurometersareintendedfthetestingofspecimenshavingathickne

13、sscrosssectionaldiameterof1.25mm(0.050in.)greateralthoughspecimensoflesserdimensionsmaybesuccessfullyaccommodatedundertheconditionsspecifiedinSection6haveaTypeMdurometerhardnessrangebetween2090.Thosespecimenswhichhaveadu

14、rometerhardnessrangeotherthanspecifiedshalluseanothersuitableprocedurefdeterminingdurometerhardness.4.SignificanceUse4.1Thistestmethodisbasedontheperationofaspecifictypeofindentwhenfcedintothematerialunderspecifiedcondit

15、ions.Theindentationhardnessisinverselyrelatedtotheperationisdependentontheelasticmodulusviscoelasticbehaviofthematerial.Thegeometryofthe1ThistestmethodisunderthejurisdictionofASTMCommitteeD11onRubberisthedirectresponsibi

16、lityofSubcommitteeD11.10onPhysicalTesting.CurrenteditionapprovedAug.152005.PublishedSeptember2005.iginallyapprovedin1964.Lastpreviouseditionapprovedin2004asD2240–04e1.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gco

17、ntactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromInternationalganizationfStardization(ISO)1ruedeVarembCasepostale56CH1211Geneva20Switzerl

18、.1Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.(2)ThedisplayfTypeOOOSdurometersshallindicatefrom0to100withnolessthan100equaldivisionsthroughouttherangeatarateofonehardnesspo

19、intfeach0.050mm(0.002in.)ofindentmovement(3)ThedisplayfTypeMdurometersshallindicatefrom0to100withnolessthan100equaldivisionsatarateofonehardnesspointfeach0.0125mm(0.0005in.)ofindentmovement(4)Inthecaseofanalogdialindicat

20、shavingadisplayof360thepointsindicating0100maybeatthesamepointonthedialindicate0100both.5.1.1.9TimingDevice(optional)capableofbeingsettoadesiredelapsedtimesignalingtheoperatholdingthehardnessreadingwhenthedesiredelapsedt

21、imehasbeenreached.Thetimershallbeautomaticallyactivatedwhenthepresserfootisincontactwiththespecimenbeingtestedfexampletheinitialindenttravelhasceased.Digitalelectronicdurometersmaybeequippedwithelectronictimingdevicestha

22、tshallnotaffecttheindicatedreadingdeterminationsattainedbymethanonehalfofthecalibrationtolerancestatedinTable1.5.1.1.10MaximumIndicats(optional)maximumindicatingpointersareauxiliaryanalogindicatinghsdesignedtoremainatthe

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