Designation:D4924−21StandardClassificationforPetroleumWaxesforUseinRubberCompounding1ThisstandardisissuedunderthefixeddesignationD4924;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationisintendedtoestablishaclassifica-tionsystemandtestmethodsforpetroleumwaxesusedinrubbercompoundingprimarilyasastaticprotectiveagentormaterialforunsaturatedrubberssuchasstyrene-butadienerubber,polyisoprenerubber,naturalrubber,chloroprenerubber,acrylonitrile-butadienerubber,andpolybutadienerub-ber.Theseunsaturatedrubbersaresubjecttoozonecracking.Undercertainexposureconditions,waxesretardthiscracking.1.2Thisclassificationisapplicabletopetroleumwaxesusedasprocessaidsinrubbercompounding.Itisnotapplicabletononpetroleumwaxessuchascarnubawax,candelillewax,orceresinwax,nortosynthetichydrocarbonwaxessuchaspolyethylenewax.Thesenon-petroleumwaxesdisplayadif-ferentbehaviorongaschromatographicanalysisthandopetroleumwaxes.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D87TestMethodforMeltingPointofPetroleumWax(CoolingCurve)D445TestMethodforKinematicViscosityofTransparentandOpaqueLiquids(andCalculationofDynamicViscos-ity)D721TestMethodforOilContentofPetroleumWaxesD938TestMethodforCongealingPointofPetroleumWaxes,IncludingPetrolatumD1321TestMeth...
