Designation:D2603−01(Reapproved2013)StandardTestMethodforSonicShearStabilityofPolymer-ContainingOils1ThisstandardisissuedunderthefixeddesignationD2603;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoverstheevaluationoftheshearstabilityofanoilcontainingpolymerintermsofthepermanentlossinviscositythatresultsfromirradiatingasampleoftheoilinasonicoscillator.Thistestmethodcanbeusefulinpredictingthecontinuityofthispropertyinanoilwherenochangeismadeinthebasestockorthepolymer.Itisnotintendedthatthistestmethodservetopredicttheperformanceofpolymer-containingoilsinservice.1.2Evidencehasbeenpresentedthatcorrelationbetweenthesheardegradationresultsobtainedbymeansofsonicoscillationandthoseobtainedinmechanicaldevicescanbepoor.Thisisespeciallytrueinthecaseofautomotiveengines.Furtherevidenceindicatesthatthesonictechniquemayratedifferentfamiliesofpolymersinadifferentorderthanme-chanicaldevices.2,31.3Becauseoftheselimitations,thecommitteeunderwhosejurisdictionthistestmethodfallshasdevelopedanalternativesheartestmethodusingadieselinjectornozzle,TestMethodD3945.Whilethattestmethodhasfoundsomeutilityintheevaluationofcrankcaseoils,thestressimpartedtothesamplehasbeenfoundtobeinsufficienttoshearpolymersoftheshear-resistanttypefoundinaircrafthydraulicfluids.1.4Thistestmethodisusedforpolymericadditivespecifications,especiallyinthehydraulicfluidmarket.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareprovidedforinformationalpurposesonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryl...
