Designation:D3527−15StandardTestMethodforLifePerformanceofAutomotiveWheelBearingGrease1ThisstandardisissuedunderthefixeddesignationD3527;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversalaboratoryprocedureforevaluatingthehigh-temperaturelifeperformanceofwheelbearinggreaseswhentestedunderprescribedconditions.NOTE1—Changestothistestmethodinthe1985revisionincreasedtestseverity.Resultswillnotbecomparablewithdatafromearlierprocedures.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.2.1Exception—Apparatusdimensionsininchesaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see8.1–8.4.2.ReferencedDocuments2.1AFBMAStandard:AFBMAStandard19,1974(ANSIB.3.19-1975)23.Terminology3.1Definitions:3.1.1lubricant,n—anymaterialinterposedbetweentwosurfacesthatreducesthefrictionorwearbetweenthem.3.1.2lubricatinggrease,n—asemi-fluidtosolidproductofadispersionofathickenerinaliquidlubricant.3.1.2.1Discussion—Thedispersionofthethickenerformsatwo-phasesystemandimmobilizestheliquidlubricantbysurfacetensionandotherphysicalforces.Otheringredientsarecommonlyincludedtoimpartspecialproperties.3.1.3thickener,n—inlubricatinggrease,asubstancecom-posedoffinely-dividedparticlesdispersedinaliquidlubricanttoformtheproduct’sstructure.3.1.3.1Discussion—Thesolidthickenercanbefibers(suchasvariousmetallicsoaps)orplatesorspheres(suchascertainnon-soapthickeners)whichareinsolubleor,atthemost,onlyveryslightlysolubleintheliquidlubricant.Thegeneralrequirementsarethatth...
