Designation:D5668−21StandardTestMethodsforRubberFromSyntheticSources—VolatileMatter1ThisstandardisissuedunderthefixeddesignationD5668;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverahotmillmethod,twoovenmethods,andapressmethodforthedeterminationofmoistureandothervolatilemattercontentinsyntheticrubber.1.2Eitherovenmethodshallbeusedespeciallywhentherubberistootackytobehandledsatisfactorilyonahotmill.1.3Thepressmethodshallbeusedforrubbersthataretoocrumblytoberetainedsatisfactorilyonalaboratorymill.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3182PracticeforRubber—Materials,Equipment,andPro-ceduresforMixingStandardCompoundsandPreparingStandardVulcanizedSheetsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE145SpecificationforGravity-ConvectionandForced-VentilationOvens3.SignificanceandUse3.1Thesetestmethodsaremainlyintendedforrefereepurposesbutcanalsobeusedforqualitycontrolofrubberproduction.3.2Theamountofvolatilescanaffectprocessingandcurecharacteristicsofcompoundedrubber.4.Apparatus4.1Mill,asdescribedinPracticeD3182.4.2Oven,asdescribedinSpecific...
