Designation:D1329−08StandardTestMethodforEvaluatingRubberProperty—RetractionatLowerTemperatures(TRTest)1ThisstandardisissuedunderthefixeddesignationD1329;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesatemperature-retractionprocedureforrapidevaluationofcrystallizationeffectsandforcomparingviscoelasticpropertiesofrubberandrubber-likematerialsatlowtemperatures.Thistestmethodisusefulwhenemployedinconjunctionwithotherlow-temperaturetestsforselectionofmaterialssuitableforlow-temperatureservice.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D832PracticeforRubberConditioningForLowTempera-tureTestingD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.SummaryofTestMethod3.1Thistestmethodiscarriedoutby(1)elongatingthespecimen,(2)lockingitintheelongatedcondition,(3)freezingittoastateofreducedelasticity,(4)releasingthefrozenspecimenandallowingittoretractfreelywhileraisingthetemperatureatauniformrate,(5)measuringthelengthofthespecimenatregulartemperatureintervalswhileitisretracting,and(6)computingthepercentageretractionatthesetempera-turesfromthedataobtained.Inpractice,thetemperaturescorrespondingto10%and70%retractionareofparticularimportance,andaredesignatedasTR10andTR70,respec-tively.4.SignificanceandUse4.1Thedifferencebetweenthetemperatureatwhichavulcanizateretracts10%(TR10)andthetemperatureatwhichavulcanizateretracts70%(TR70)increasesasthetenden...
