Designation:D6896−20aStandardTestMethodforDeterminationofYieldStressandApparentViscosityofUsedEngineOilsatLowTemperature1ThisstandardisissuedunderthefixeddesignationD6896;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthemeasurementoftheyieldstressandviscosityofengineoilsaftercoolingatcontrolledratesoveraperiodof43hor45htoafinaltesttemperatureof–20°Cor–25°C.Theprecisionisstatedfortesttemperatures–20°Cand–25°C.Theviscositymeasurementsaremadeatashearstressof525Paoverashearrateof0.4s-1to15s-1.Thistestmethodissuitableformeasurementofviscositiesrangingfrom4000mPa·sto>400000mPa·s,andissuitableforyieldstressmeasurementsof7Pato>350Pa.1.2Thistestmethodisapplicableforuseddieseloils.Theapplicabilityandprecisiontootherusedorunusedengineoilsortopetroleumproductsotherthanengineoilshasnotbeendetermined.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1Exception—ThistestmethodusestheSIbasedunitofmilliPascalsecond(mPa·s)forviscositywhichisequivalenttocentiPoise(cP).1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3829TestMethodforPredictingtheBorderlinePumpingTemperatureofEngineOilD4684TestMethodforDeterminationofYieldStressandApparentViscosityofEngi...
