Designation:D6185−11(Reapproved2017)StandardPracticeforEvaluatingCompatibilityofBinaryMixturesofLubricatingGreases1ThisstandardisissuedunderthefixeddesignationD6185;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversaprotocolforevaluatingthecompatibilityofoneorthreebinarymixturesoflubricatinggreasesbycomparingtheirpropertiesorperformancerelativetothoseoftheneatgreasescomprisingthemixture.1.2Threepropertiesareevaluatedinaprimarytestingprotocolusingstandardtestmethods:(1)droppingpointbyTestMethodD566(orTestMethodD2265);(2)shearstabilitybyTestMethodsD217,100000-strokeworkedpenetration;and(3)storagestabilityatelevated-temperaturebychangein60-strokepenetration(TestMethodD217).Forcompatiblemixtures(thosepassingallprimarytesting),asecondary(nonmandatory)testingschemeissuggestedwhencircum-stancesindicatetheneedforadditionaltesting.1.3Sequentialorconcurrenttestingiscontinueduntilthefirstfailure.Ifanymixturefailsanyoftheprimarytests,thegreasesareincompatible.Ifallmixturespassthethreeprimarytests,thegreasesareconsideredcompatible.1.4Thispracticeappliesonlytolubricatinggreaseshavingcharacteristicssuitableforevaluationbythesuggestedtestmethods.Ifthescopeofaspecifictestmethodlimitstestingtothosegreaseswithinaspecifiedrangeofproperties,greasesoutsidethatrangecannotbetestedforcompatibilitybythattestmethod.Anexceptiontothiswouldbewhenthetestedpropertyoftheneat,constituentgreasesiswithinthespecifiedrange,butthetestedpropertyofamixtureisoutsidetherangebecauseofincompatibility.1.5Thispracticedoesnotpurporttocoveralltestmethodsthatcouldbeemployed.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibil...
