Designation:D4425−19StandardTestMethodforOilSeparationfromLubricatingGreasebyCentrifuging(KoppersMethod)1ThisstandardisissuedunderthefixeddesignationD4425;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversaprocedurefordeterminingthetendencyoflubricatinggreasetoseparateoilwhensubjectedtohighcentrifugalforces.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D217TestMethodsforConePenetrationofLubricatingGrease3.Terminology3.1Definitions:3.1.1lubricatinggrease,n—asemi-fluidtosolidproductofadispersionofathickenerinaliquidlubricant.3.1.1.1Discussion—Thedispersionofthethickenerformsatwo-phasesystemandimmobilizestheliquidlubricantbysurfacetensionandotherphysicalforces.Otheringredientsarecommonlyincludedtoimpartspecialproperties.D2173.1.2thickener,n—inlubricatinggrease,asubstancecom-posedoffinely-dividedparticlesdispersedinaliquidtoformtheproducts’sstructure.3.1.2.1Discussion—Thickenerscanbefibers(suchasvari-ousmetallicsoaps)orplatesorspheres(suchascertainnon-soapthickeners),whichareinsolubleor,atmost,onlyveryslightlysolubleintheliquidlubricant.Thegeneralrequire-mentsarethatthesolidparticlesbeextremelysmall,u...
