Designation:D4289−21StandardTestMethodforElastomerCompatibilityofLubricatingGreasesandFluids1ThisstandardisissuedunderthefixeddesignationD4289;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodevaluatesthecompatibilityoflubricat-inggreasesandfluidswithcouponscutfromstandardelasto-mersheets(PracticeD3182).CompatibilityisevaluatedbydeterminingthechangesinvolumeandDurometerAhardnessthatoccurwhenelastomercouponsaretotallyimmersedinalubricantsamplefor70horforadurationasrequiredbythelubricantspecificationateither100°Cor150°Coratatesttemperatureasrequiredbythelubricantspecification.1.1.1Somelubricantspecificationsmayrequiredifferentelastomersortestconditions,suchaslongerdurationsorlowerorhighertemperatures.Insuchinstances,therepeatabilityandreproducibilityvaluesstatedinSection12donotapply,andtheuserandsuppliershouldagreeonacceptablelimitsofpreci-sion.NOTE1—Thescopeofthistestmethodnowincludestheevaluationoftheelastomercompatibilityofbothlubricatingfluidsandgreases.TestingoffluidswasnotincludedinTestMethodD4289–95andearlierversions.1.2Thistestmethodcanalsobeusedasaguidetoevaluatethecompatibilityofgreaseswithrubberproductsnotinstandardsheetform(PracticeD3183).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1Exception—Whenlisted,DurometerAunitsshallberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see8.4–8.6.1.5Thisinternationalstandardwasdevelopedinaccor...
