Designation:D7426−08(Reapproved2013)StandardTestMethodforAssignmentoftheDSCProcedureforDeterminingTgofaPolymeroranElastomericCompound1ThisstandardisissuedunderthefixeddesignationD7426;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheassignmentoftheglasstransitiontemperatures(Tg)ofmaterialsusingdifferentialscanningcalorimetry.1.2Thistestmethodisapplicabletoamorphousmaterials,includingthermosetsorsemicrystalinematerialscontainingamorphousregions,thatarestableanddonotundergodecom-positionorsublimationintheglasstransitionregion.1.3Thenormaloperatingtemperaturerangeisfrom–120to500°C.Thetemperaturerangemaybeextended,dependingupontheinstrumentationused.1.4Computerorelectronic-basedinstruments,techniques,ordatatreatmentequivalenttothistestmethodmayalsobeused.NOTE1—Usersofthistestmethodareexpresslyadvisedthatallsuchinstrumentsortechniquesmaynotbeequivalent.Itistheresponsibilityoftheuserofthisstandardtodeterminethenecessaryequivalencypriortouse.1.5ISO11357–2isequivalenttothistestmethod.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE473TerminologyRelatingtoThermalAnalysisandRhe-ologyE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodE967TestMethodforTemperatureCalibrationofDifferen-tialScanningCalorimetersandDifferentialThermalAna-lyzersE1142TerminologyRelatingtoThermophysicalProperties2.2ISOStandard:3ISO11357...
