Designation:D6022−06(Reapproved2012)StandardPracticeforCalculationofPermanentShearStabilityIndex1ThisstandardisissuedunderthefixeddesignationD6022;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticespecifiestheprocedureforthecalculationofPermanentShearStabilityIndex(PSSI)ofanadditiveusingviscositiesbeforeandafterashearingprocedure.1.2PSSIiscalculatedforasingleblendcomponentandcanthenbeusedtoestimatetheeffectsofthatcomponentonfinishedlubricantblends.1.3Thispracticeisapplicabletomanyproductsandmayusedatafrommanydifferenttestmethods.Thecalculationispresentedinitsmostgeneralforminordernottorestrictitsuse.2.ReferencedDocuments2.1ASTMStandards:2D2603TestMethodforSonicShearStabilityofPolymer-ContainingOilsD4485SpecificationforPerformanceofActiveAPIServiceCategoryEngineOilsD5119TestMethodforEvaluationofAutomotiveEngineOilsintheCRCL-38Spark-IgnitionEngine(Withdrawn2003)3D5275TestMethodforFuelInjectorShearStabilityTest(FISST)forPolymerContainingFluidsD5621TestMethodforSonicShearStabilityofHydraulicFluidsD6278TestMethodforShearStabilityofPolymerContain-ingFluidsUsingaEuropeanDieselInjectorApparatusD7109TestMethodforShearStabilityofPolymerContain-ingFluidsUsingaEuropeanDieselInjectorApparatusat30and90Cycles2.2CECStandards:4CECL14A93EvaluationoftheMechanicalShearStabilityofLubricatingOilsContainingPolymersCECL37T85ShearStabilityofPolymer-ContainingOils(FZG)CECL45T93ViscosityShearStabilityofTransmissionLubricants(KRL)3.Terminology3.1Definitions:3.1.1degreeofthickening(DT),n—theratioofanoil’sviscositywithanadditivetothatoil’sviscositywithouttheadditive.Ameasureoftheamountbywhichanadditiveincreasesthebasefluidviscosity.3.1.2permanentshearstabilityindex(PSSI),n—ameasureoftheirreversibledecrease,resultingfromshear,inanoil’sviscositycontributedbyanaddi...
