Designation:D4419−90(Reapproved2021)StandardTestMethodforMeasurementofTransitionTemperaturesofPetroleumWaxesbyDifferentialScanningCalorimetry(DSC)1ThisstandardisissuedunderthefixeddesignationD4419;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthetransitiontemperaturesofpetroleumwaxes,includingmicrocrystallinewaxes,bydiffer-entialscanningcalorimetry(DSC).Thesetransitionsmayoccurasasolid-solidtransitionorasasolid-liquidtransition.1.2Thenormaloperatingtemperaturerangeextendsfrom15°Cto150°C(Note1).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D87TestMethodforMeltingPointofPetroleumWax(CoolingCurve)D1160TestMethodforDistillationofPetroleumProductsatReducedPressureD3418TestMethodforTransitionTemperaturesandEn-thalpiesofFusionandCrystallizationofPolymersbyDifferentialScanningCalorimetryE472PracticeforReportingThermoanalyticalData(With-drawn1995)3E473TerminologyRelatingtoThermalAnalysisandRhe-ologyE474MethodforEvaluationofTemperatureScaleforDif-ferentialThermalAnalysis(Withdrawn1986)33.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1DifferentialScanningCalorimetry(DSC),n—Atech-niqueinwhichthedifferenceinenergyinputsintoasubstanceandarefere...
