Designation:D4950−19StandardClassificationandSpecificationforAutomotiveServiceGreases1,2ThisstandardisissuedunderthefixeddesignationD4950;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThisspecificationdescribescurrentcategoriesoflubricatinggreasesforautomotiveservice-fillapplications.Aspecificdesignationisassignedtoeachcategory.Thesystemisopenended,thatis,newdesignationsareassignedforusewithnewcategoriesaseachnewsetofgreaseperformancecharacteristicsisdefined.Greasecategoriesarereferencedbyautomotivemanufacturersinmakinglubricationrecommendationsandusedbygreasesuppliersandusersinidentifyingproductsforspecificapplications.1.Scope*1.1Thisspecificationcoverslubricatinggreasessuitablefortheperiodicrelubricationofchassissystemsandwheelbear-ingsofpassengercars,trucks,andothervehicles.1.2Thisspecificationdefinestherequirementsusedtodescribethepropertiesandperformancecharacteristicsofchassisgreasesandwheelbearinggreasesforservice-fillapplications.1.3Thetestrequirements(acceptancelimits)giveninthisspecificationare,asthecasemaybe,minimumormaximumacceptablevaluesforvalidduplicatetestresults.Applynoadditionalcorrectionsfortestprecision,suchasdescribedinPracticeD3244,inasmuchastheprecisionofthetestmethodswastakenintoaccountinthedeterminationoftherequire-ments.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.4.1Exceptions—TestMethodD2596reportstestresultsinkgfunits,andTestMethodD4289reportsrubberhardnessinDurometerShoreAunits.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D217Tes...
