Designation:D2416−20StandardTestMethodforCokingValueofTarandPitch(ModifiedConradson)1ThisstandardisissuedunderthefixeddesignationD2416;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthecokingvalueoftarandpitchhavinganashcontentnotover0.5%asdeterminedbyTestMethodD2415.1.2CokingvaluesbythistestmethodarepracticallythesameasthoseobtainedbyTestMethodD189,butresultsaremorereproducible.Theapparatususedisidentical,exceptthatanelectricfurnaceissubstitutedforthegasflame.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D140PracticeforSamplingAsphaltMaterialsD189TestMethodforConradsonCarbonResidueofPetro-leumProductsD370PracticeforDehydrationofOil-TypePreservativesD2415TestMethodforAshinCoalTarandPitchE11SpecificationforWovenWireTestSieveClothandTestSieves3.SummaryofTestMethod3.1Asampleofthetarorpitchisvaporizedandpyrolizedforaspecifiedtimeataspecifiedtemperatureinspecialstandardizedequipmentthatlimitstheavailableoxygensup-ply.Thepercentageofresidueisreportedasthecokingvalue.4.SignificanceandUse4.1Thistestmethodisusefulforindicatingtherelativecoke-formingpropensitiesandforevaluatingandcharacteriz...
