Designation:D6616−21StandardTestMethodforMeasuringViscosityatHighShearRatebyTaperedBearingSimulatorViscometerat100°C1ThisstandardisissuedunderthefixeddesignationD6616;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthelaboratorydeterminationoftheviscosityofengineoilsat100°Cand1·106s–1usingtheTaperedBearingSimulator(TBS)viscometer.2NOTE1—ThistestmethodissimilartoTestMethodD4683whichusesthesameTBSviscometertomeasurehighshearviscosityat150°C.1.2TheNewtoniancalibrationoilsusedtoestablishthistestmethodrangefromapproximately5mPa·s(cP)to12mPa·s(cP)at100°Candeitherthemanualorautomatedprotocolwasusedbyeachparticipantindevelopingtheprecisionstatement.Theviscosityrangeofthetestmethodatthistemperatureisfrom1mPa·s(cP)toabove25mPa·s(cP),dependingonthemodelofTBS.1.3Thenon-Newtonianreferenceoilusedtoestablishtheshearrateof1·106s–1forthistestmethodhasaviscosityofapproximately10mPa·sat100°C.1.4Applicationtopetroleumproductsotherthanengineoilhasnotbeendeterminedinpreparingtheviscometricinforma-tionforthistestmethod.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.ThistestmethodusesthemilliPascalsecond(mPa·s)astheunitofviscosity.ThisunitisequivalenttothecentiPoise(cP),whichisshowninparentheses.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTrade...
