Designation:D832−07(Reapproved2012)StandardPracticeforRubberConditioningForLowTemperatureTesting1ThisstandardisissuedunderthefixeddesignationD832;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thispracticecoversthecharacteristicmechanicalbe-haviorofrubbersatlowtemperatures,andoutlinesthecondi-tioningprocedurenecessaryfortestingatthesetemperatures.1.2Oneofthefirststagesinestablishingasatisfactorytechniqueforlowtemperaturetestingisthespecificationofthetimeandtemperatureofexposureofthetestspecimen.Ithasbeendemonstratedthatanyoneormoreofthefollowingdistinctchanges,whicharedetailedinTable1,maytakeplaceonloweringthetesttemperature:1.2.1Simpletemperatureeffects,1.2.2Glasstransitions,and1.2.3Firstordertransitions(crystallization),andsolubilityandothereffectsassociatedwithplasticizers.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D471TestMethodforRubberProperty—EffectofLiquidsD1053TestMethodsforRubberProperty—StiffeningatLowTemperatures:FlexiblePolymersandCoatedFabricsD1329TestMethodforEvaluatingRubberProperty—RetractionatLowerTemperatures(TRTest)D1566TerminologyRelatingtoRubberD2136TestMethodforCoatedFabrics—Low-TemperatureBendTestD5964PracticeforRubberIRM901,IRM902,andIRM903ReplacementOilsforASTMNo.1,ASTMNo.2,andASTMNo.3Oils3.SignificanceandUse3.1Lowtemperaturetestingofrubbercanyieldrepeatableresultsonlyifthepreconditioningofthesamplesisconsistent.Propertiessuchasbrittlenessandmodulusaregreatlyaffectedbyvariationsintime/temperatureexposures.Thispractic...
