Designation:D4624–93(Reapproved1998)AnAmericanNationalStandardStandardTestMethodforMeasuringApparentViscositybyCapillaryViscometeratHigh-TemperatureandHigh-ShearRates1ThisstandardisissuedunderthefixeddesignationD4624;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.INTRODUCTIONSeveraldifferentconfigurationsofcapillaryviscometershavebeensuccessfullyusedformeasuringtheviscosityofengineoilsatthehigh-shearratesandhightemperaturesthatoccurinengines.Thistestmethodevolvedfromacooperativeprogramthatincludedawidevarietyofviscometerdesignsandprocedures.Therefore,thistestmethodisverygeneralbutitsprecisionhasnotbeenestablishedforanyviscometerdesignsorproceduresnotevaluatedinthecooperativeprogram.1.Scope1.1Thistestmethodcoversthemeasurementofhightem-peraturehigh-shearviscosityat150°C.Theshearrateforthistestmethodcorrespondstoanapparentshearrateatthewallof106s−1.ThisistheshearrateatthewallcalculatedforaNewtonianoil.Fornon-Newtonianoils,theacturalshearrateatthewallwillvaryfromthisvalue.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1217TestMethodforDensityandRelativeDensity(SpecificGravity)ofLiquidsbyBinghamPycnometer2D4683TestMethodforMeasuringViscosityatHighTem-peratureandHighShearRatebyTaperedBearingSimu-lator3D4741TestMethodforMeasuringViscosityatHighTem-peratureandHighShearRatebyTaperedPlugViscom-eter33.Terminology3.1Definitions:3.1.1viscosity—theratiobetweenshearstressandshearrateatthesamelocation.Itissometimescalledthecoefficientofviscosity,orthedynamicviscosity.Itisa...
