Designation:D7138−08AnAmericanNationalStandardStandardTestMethodtoDetermineMeltingTemperatureofSyntheticFibers1ThisstandardisissuedunderthefixeddesignationD7138;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Eitheroftwotestmethodsareusedtodeterminethemeltingtemperatureofthermoplasticfibers,yarns,orthreads.1.2Method1canbeusedtodeterminemeltingtempera-turesforblendsofmultiplefibermaterialtypes.Method2canonlybeusedtodeterminethemeltingtemperatureofasinglefibermaterialtype.1.2.1Method1,DifferentialScanningCalorimetry(DSC),measureschangesinheatcapacityandwilldetecttheglasstransition,thecrystallinemeltingandendothermicthermaldegradation.1.2.2Method2,avisualdeterminationofmelting,deter-minesanychangethatvisuallyappearsasatransitionfromasolidtoaliquidstate.1.2.3Duetothedifferencesinwhateachtestmethodmeasures,theresultsfromMethod1andMethod2cannotbecompared.1.3ThevaluesstatedineitherSIunitsorotherunitsaretoberegardedseparately.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemshallbeusedinde-pendentlywithoutcombiningvalues.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandard:2D123TerminologyRelatingtoTextilesD276TestMethodsforIdentificationofFibersinTextilesD1776PracticeforConditioningandTestingTextilesD2257TestMethodforExtractableMatterinTextilesD2258PracticeforSamplingYarnforTestingD3333PracticeforSamplingManufacturedStapleFibers,Sliver,orTowforTesting3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1meltingtemperature,n—thetemperatureorrangeoftemperaturesatwhichasubstanceisobservedtotransitiontoaliq...
