Designation:D128−98(Reapproved2019)StandardTestMethodsforAnalysisofLubricatingGrease1ThisstandardisissuedunderthefixeddesignationD128;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodsforanalysiscovergreasesoftheconventionaltype,whichconsistessentiallyofpetroleumoilandsoap.Theconstituentsthatcanbedeterminedaresoap,unsaponifiablematter(petroleumoil,andsoforth),water,freealkalinity,freefattyacid,fat,glycerin,andinsolubles.NOTE1—Anyofthetestmethodsdescribedhereinarebestusedbyanexperiencedgreaseanalystwhomayalsobeabletomakeappropriateadaptationsofthetechniquesasoccasionrequires.1.2AsupplementarytestmethodisprovidedinAppendixX1.Thistestmethodisintendedprimarilyforapplicationtogreasescontainingthickenersthatareessentiallyinsolubleinn-hexane,andtogreasesthatcannotbeanalyzedbyconven-tionalmethodsbecauseofthepresenceofsuchconstituentsasnonpetroleumfluidsornonsoap-typethickeners,orboth.Insomecases,theseconstituentscanreactwithstrongacidoralkalinesolutions.1.3Thesetestmethodsappearinthefollowingorder:SectionsAshDetermination7–11Insolubles,Soap,Fat,PetroleumOil,andUnsaponifiableMatter12–20FreeAlkaliandFreeAcid21–23Water24Glycerin(Quantitative)25–291.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofIntern...
