Designation:D6080−18aStandardPracticeforDefiningtheViscosityCharacteristicsofHydraulicFluids1ThisstandardisissuedunderthefixeddesignationD6080;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversallhydraulicfluidsbasedeitheronpetroleum,synthetic,ornaturally-occurringbasestocks.Itisnotintendedforwater-containinghydraulicfluids.1.2Fordeterminationofviscositiesatlowtemperature,thispracticeusesmillipascal·second(mPa·s)astheunitofviscos-ity.Forreference,1mPa·sisequivalentto1centipoise(cP).Fordeterminationofviscositiesathightemperature,thispracticeusesmillimetresquaredpersecond(mm2/s)astheunitofkinematicviscosity.Forreference,1mm2/sisequivalentto1centistoke(cSt).1.3Thispracticeisapplicabletofluidsranginginkinematicviscosityfromabout4mm2/sto150mm2/sasmeasuredatareferencetemperatureof40°Candtotemperaturesfrom−50°Cto+16°Cforafluidviscosityof750mPa·s.NOTE1—Fluidsoflesserorgreaterviscositythantherangedescribedin1.3areseldomusedashydraulicfluids.Anymathematicalextrapolationofthesystemtoeitherhigherorlowerviscositygradesmaynotbeappropriate.Anyneedtoexpandthesystemshouldbeevaluatedonitsownmerit.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D445TestMethodforKinematicViscosityofTransparentandOpaqueLiquids(andCalculationofDynamicViscos-ity)D2270PracticeforCalculatingViscosityIndexfromKine-maticViscosityat40°Cand100°CD2422ClassificationofIndustrialFluidLubricantsby...
