Designation:D3156−96(Reapproved2016)StandardPracticeforRubber—ChromatographicAnalysisofAntidegradants(Antioxidants,AntiozonantsandStabilizers)1ThisstandardisissuedunderthefixeddesignationD3156;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthedetectionandidentificationbythin-layerchromatographyofantidegradants(antioxidants,antiozonants,andstabilizers)thatmaybepresentinrawrubberorrubberproducts.Analysisforothertypesofantidegradantsispossibleaslongastherequirementsofthepracticearemet.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocument2.1ASTMStandards:2D297TestMethodsforRubberProducts—ChemicalAnaly-sis3.SummaryofPractice3.1Asimplifiedprocedure(MethodA,Section13.1)basedonasingle-solventsystemispresented,whichprovidesfortheidentificationofknownmaterials.Thismaybeusedtocheckthepresenceorabsenceinarubbervulcanizateorrawrubber,ofanantidegradantwhichshouldbepresent.However,sincethechromatogramsobtainedmaynotbeabsolutelyspecificforanygivenantidegradant,amoredetailedschemeisgivenin13.2.3.2MethodB,Section13.2,usingadditionalsolventsandspraysisincluded,whichenablesagreaterdegreeofseparationofthespotstobemadeandthereforemayenabledetectionandidentificationofanunknownantidegradant.3.3Othertechniques,forexample:gaschromatographic(withorwithouttreatmenttoobtainderivatives),spectroscopic(ultravioletandinfrared),moresophisticatedthin-layervaria-tions(twodimensionaltechniques),maybeappliedtoidenti-ficationofspotsforimproveddetectionandidentificationofanunknownantidegradant.3.4Itispossi...
