Designation:F2625−10StandardTestMethodforMeasurementofEnthalpyofFusion,PercentCrystallinity,andMeltingPointofUltra-High-MolecularWeightPolyethylenebyMeansofDifferentialScanningCalorimetry1ThisstandardisissuedunderthefixeddesignationF2625;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddiscussesthemeasurementoftheheatoffusionandthemeltingpointofultra-high-molecularweightpolyethylene(UHMWPE),andthesubsequentcalculationofthepercentageofcrystallinity.1.2ThistestmethodcanbeusedforUHMWPEinpowderform,consolidatedform,finishedproduct,orausedproduct.Itcanalsobeusedforirradiatedorchemically-crosslinkedUHMWPE.1.3Thistestmethoddoesnotsuggestadesiredrangeofcrystallinityormeltingpointsforspecificapplications.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3418TestMethodforTransitionTemperaturesandEn-thalpiesofFusionandCrystallizationofPolymersbyDifferentialScanningCalorimetryE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodE793TestMethodforEnthalpiesofFusionandCrystalliza-tionbyDifferentialScanningCalorimetryE967TestMethodforTemperatureCalibrationofDifferen-tialScanningCalorimetersandDifferentialThermalAna-lyzersE968PracticeforHeatFlowCalibrationofDifferentialScanningCalorimetersE1953PracticeforDescriptionofThermalAnalysisandRheologyApparatus3.Terminology3.1Symbols:3.1.1∆Hf,n—theoreticalheatoffusionof100%crystallinematerial(J/g).3.1.2∆Hs,n—massnormalizedheatoffusionofthetestsamp...
