Designation:D4937−96(Reapproved2021)StandardTestMethodforp-PhenylenediamineAntidegradantsPuritybyGasChromatography1ThisstandardisissuedunderthefixeddesignationD4937;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthedeterminationofthepurityofClassI,II,andIIIp-phenylenediamine(PPD)antidegradantsasdescribedinClassificationD4676bygaschromatography(GC)detectionandareanormalizationfordatareduction.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3853TerminologyRelatingtoRubberandRubberLatices—AbbreviationsforChemicalsUsedinCom-poundingD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesD4676ClassificationforRubberCompoundingMaterials—AntidegradantsE260PracticeforPackedColumnGasChromatography2.2ISOStandard:3ISO6472RubberCompoundingIngredients—Abbreviations3.Terminology3.1Definitions:3.1.1areanormalization,n—amethodofcalculatingthepercentcompositionbymeasuringtheareaofeachobservedpeakanddividingeachpeakareabythetotalarea.Thisassumesthatallpeaksareelutedandthateachcomponenthasthesamedetectorresponse.3.1.2lotsample,n—aproductionsamplerepresentativeofasta...
