Designation:D575−91(Reapproved2012)StandardTestMethodsforRubberPropertiesinCompression1ThisstandardisissuedunderthefixeddesignationD575;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscovertwotestproceduresfordeter-miningthecompression-deflectioncharacteristicsofrubbercompoundsotherthanthoseusuallyclassifiedashardrubberandspongerubber.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3183PracticeforRubber—PreparationofPiecesforTestPurposesfromProductsD3767PracticeforRubber—MeasurementofDimensionsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE4PracticesforForceVerificationofTestingMachines3.SummaryofTestMethods3.1Thesetestsconstituteonekindofcompressionstiffnessmeasurement.Deflectionisthechangeinthicknessofthespecimenuponapplicationofacompressiveforce.Thetwodifferentproceduresareasfollows:3.1.1TestMethodA—CompressionTestofSpecifiedDeflection—Acompressiontestinwhichtheforcerequiredtocauseaspecifieddeflectionisdetermined.3.1.2TestMethodB—CompressionTestatSpecifiedForce—Acompressiontestinwhichthespecifiedmassorcompressiveforceisplacedonthespecimenandtheresultingdeflectionismeasuredandrecorded.4.SignificanceandUse4.1Thesetestmethodsareusefulincomparingstiffnessofrubbermaterialsincompression.Theycanbeusedbyrubbertechnologiststoaidindevelopmentofmaterialsforcompres-siveappl...
