Designation:D575−91(Reapproved2018)StandardTestMethodsforRubberPropertiesinCompression1ThisstandardisissuedunderthefixeddesignationD575;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscovertwotestproceduresfordeter-miningthecompression-deflectioncharacteristicsofrubbercompoundsotherthanthoseusuallyclassifiedashardrubberandspongerubber.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3183PracticeforRubber—PreparationofPiecesforTestPurposesfromProductsD3767PracticeforRubber—MeasurementofDimensionsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE4PracticesforForceVerificationofTestingMachines3.SummaryofTestMethods3.1Thesetestsconstituteonekindofcompressionstiffnessmeasurement.Deflectionisthechangeinthicknessofthespecimenuponapplicationofacompressiveforce.Thetwodifferentproceduresareasfollows:3.1.1TestMethodA—CompressionTestofSpecifiedDeflection—Acompressiontestinwhichtheforcerequiredtocauseaspecifieddeflectionisdetermined.3.1.2TestMethodB—CompressionTestatSpecifiedForce—Acompr...
