Designation:D2502−14StandardTestMethodforEstimationofMeanRelativeMolecularMassofPetroleumOilsfromViscosityMeasurements1ThisstandardisissuedunderthefixeddesignationD2502;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheestimationofthemeanrelativemolecularmassofpetroleumoilsfromkinematicviscositymeasurementsat100°Fand210°F(37.78°Cand98.89°C).2Itisapplicabletosampleswithmeanrelativemolecularmassesintherangefrom250to700andisintendedforusewithaveragepetroleumfractions.Itshouldnotbeappliedindiscriminatelytooilsthatrepresentextremesofcompositionorpossessanexceptionallynarrowmeanrelativemolecularmassrange.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D445TestMethodforKinematicViscosityofTransparentandOpaqueLiquids(andCalculationofDynamicViscos-ity)D7042TestMethodforDynamicViscosityandDensityofLiquidsbyStabingerViscometer(andtheCalculationofKinematicViscosity)2.2ASTMAdjuncts:MeanRelativeMolecularMassofPetroleumOilsfromViscosityMeasurements43.SummaryofTestMethod3.1Thekinematicviscosityoftheoilisdeterminedat100°Fand210°F(37.78°Cand98.89°C).Afunction“H”ofthe100°FviscosityisestablishedbyreferencetoatabulationofHfunctionversus100°Fviscosity.TheHvalueandthe210°Fviscosityarethenusedtoestimatethemeanrelativemolecularmassfromacorrelationchart.4.SignificanceandUse4.1Thistestmethodprovidesameansofcalculatingthemeanrelati...
