Designation:D217−21aDesignation:50/17StandardTestMethodsforConePenetrationofLubricatingGrease1,2ThisstandardisissuedunderthefixeddesignationD217;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverfourproceduresformeasuringtheconsistencyoflubricatinggreasesbythepenetrationofaconeofspecifieddimensions,mass,andfinish.Thepenetrationismeasuredintenthsofamillimetre.NOTE1—TheNationalLubricatingGreaseInstitute(NLGI)3classifiedgreasesaccordingtotheirconsistencyasmeasuredbytheworkedpenetration.Theclassificationsystemisasfollows:NLGIConsistencyNumberWorkedPenetrationRange,25°C(77°F)000445to47500400to4300355to3851310to3402265to2953220to2504175to2055130to160685to1151.1.1Theproceduresforunworked,worked,andprolongedworkedpenetrationareapplicabletogreaseshavingpenetra-tionsbetween85and475,thatis,togreaseswithconsistencynumbersbetweenNLGI6andNLGI000.Anundisturbedpenetrationtest,describedinAppendixX1,issimilartotheunworkedpenetrationtest.1.1.2Theblockpenetrationprocedureisapplicabletogreasesthataresufficientlyhardtoholdtheirshape.Suchgreasesusuallyhavepenetrationsbeloweighty-fivetenthsofamillimetre.1.1.3Unworkedpenetrationsdonotgenerallyrepresenttheconsistencyofgreasesinuseaseffectivelyasdoworkedpenetrations.Thelatterareusuallypreferredforinspectinglubricatinggreases.1.2Noneofthefourproceduresisconsideredsuitableforthemeasurementoftheconsistencyofpetrolatumsbypenetra-tion.TestMethodD937shouldbeusedforsuchproducts.1.3ThedimensionsoftheequipmentdescribedinthesetestmethodsaregiveninSIunitsastheprimaryunitofmeasurewithequivalentimperialunitsasaccetpablealternativeswhereapplicable.IncaseswhereequivalentSIconversionsarenotknown,notesareaddedforclarification.Temperaturesandotherd...
