Designation:G114−14StandardPracticesforEvaluatingtheAgeResistanceofPolymericMaterialsUsedinOxygenService1ThisstandardisissuedunderthefixeddesignationG114;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesepracticesdescribeproceduresthatareusedtodeterminetheageresistanceofplastic,thermosetting,elastomeric,andpolymermatrixcompositematerialsexposedtooxygen-containingmedia.1.2Whilethesepracticesfocusonevaluatingtheageresistanceofpolymericmaterialsinoxygen-containingmediapriortoignitionandcombustiontesting,theyalsohaverelevanceforevaluatingtheageresistanceofmetals,andnonmetallicoilsandgreases.1.3Thesepracticesaddressbothestablishedproceduresthathaveafoundationofexperienceandnewproceduresthathaveyettobevalidated.Thelatterareincludedtopromoteresearchandlaterelaborationinthispracticeasmethodsoftheformertype.1.4Theresultsofthesepracticesmaynotgiveexactcorrelationwithserviceperformancesinceserviceconditionsvarywidelyandmayinvolvemultiplefactorssuchasthoselistedinsubsection5.8.1.5Threeproceduresaredescribedforevaluatingtheageresistanceofpolymericmaterialsdependingonapplicationandinformationsought.1.5.1ProcedureA:NaturalAging—Thisprocedureisusedtosimulatetheeffect(s)ofoneormoreservicestressorsonamaterial’soxygenresistance,andissuitableforevaluatingmaterialsthatexperiencecontinuousorintermittentexposuretoelevatedtemperatureduringservice.1.5.2ProcedureB:AcceleratedAgingComparativeOxygenResistance—Thisprocedureissuitableforevaluatingmaterialsthatareusedinambienttemperatureservice,oratatempera-turethatisotherwiselowerthantheagingtemperature,andisusefulfordevelopingoxygencompatibilityrankingsonalaboratorycomparisonbasis.1.5.3ProcedureC:AcceleratedAgingLifetimePrediction—Thisprocedureisusedtodeterminetherelationshipbetweenagingtemperatureandafixedlevelofprope...
