Designation:D4048−10StandardTestMethodforDetectionofCopperCorrosionfromLubricatingGrease1ThisstandardisissuedunderthefixeddesignationD4048;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversthedetectionofthecorrosive-nesstocopperoflubricatinggrease.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,seeSections7,8,and10.2.ReferencedDocuments2.1ASTMStandards:2D97TestMethodforPourPointofPetroleumProductsD130TestMethodforCorrosivenesstoCopperfromPetro-leumProductsbyCopperStripTestD2500TestMethodforCloudPointofPetroleumProductsD4175TerminologyRelatingtoPetroleum,PetroleumProd-ucts,andLubricants2.2ASTMAdjuncts:CopperStripCorrosionStandard33.Terminology3.1Definitions—SeeTerminologyD4175.3.2coppercorrosion,n—effectofachemicalattackoncoppermetalbyalubricantcausingvariouslevelsoftarnishingandchangeinappearance.3.2.1Discussion—Acidicandotheraggressivespecies,of-tensulfur-based,inalubricantcanattackcopperorcopperalloyspresentinbearingsorotherlubricatedsurfaces.Thepresenceofthisantagonisticinteractionisoftenapparentinawell-definedseriesofcolorchanges.3.3lubricant,n—anymaterialinterposedbetweentwosur-facesthatreducesthefrictionorwearbetweenthem.3.4lubricatinggrease,n—asemi-fluidtosolidproductofadispersionofathickenerinaliquidlubricant.3.4.1Discussion—Thedispersionofthethickenerformsatwo-phasesystemandimmobilizestheliquidlubricantbysurfacetensionandotherphy...
