Designation:D5133−15StandardTestMethodforLowTemperature,LowShearRate,Viscosity/TemperatureDependenceofLubricatingOilsUsingaTemperature-ScanningTechnique1ThisstandardisissuedunderthefixeddesignationD5133;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthemeasurementoftheappar-entviscosityofengineoilatlowtemperatures.1.2Ashearrateofapproximately0.2s-1isproducedatshearstressesbelow100Pa.Apparentviscosityismeasuredcontinuouslyasthesampleiscooledatarateof1°C⁄hovertherange−5°Cto−40°C,ortothetemperatureatwhichtheviscosityexceeds40000mPa·s(cP).1.3Themeasurementsresultingfromthistestmethodareviscosity,themaximumrateofviscosityincrease(GelationIndex),andthetemperatureatwhichtheGelationIndexoccurs.1.4Applicabilitytopetroleumproductsotherthanengineoilshasnotbeendeterminedinpreparingthistestmethod.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D341PracticeforViscosity-TemperatureChartsforLiquidPetroleumProductsD3829TestMethodforPredictingtheBorderlinePumpingTemperatureofEngineOilD4684TestMethodforDeterminationofYieldStressandApparentViscosityofEngineOilsatLowTemperature3.Terminology3.1Definitions:3.1.1apparentviscosity,n—theviscosityobtainedbyuseofthistestmethod.3.1.1.1Discussion—See3.1.6fordefinitionofviscosityandunits.3.1.2Newtonianoil,n—anoilthat,atagiventemperature,exhibitsaconstantviscosityatallshearratesorshearstresses.3.1.3non-Newtonianoil,n—anoilthat,atagiventemperature,exhibitsaviscosityt...
