Designation:D6339−11StandardClassificationSystemforandBasisforSpecificationsforSyndiotacticPolystyreneMoldingandExtrusion(SPS)1ThisstandardisissuedunderthefixeddesignationD6339;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisclassificationsystemcoverssyndiotacticpolysty-renematerialsincludinghomopolymer,copolymers,blends,andimpactmodified,suitableformoldingandextrusion.Recycledproductwillbeaddressedinaseparatestandard.1.2Thisclassificationsystemandsubsequentlinecallout(specification)areintendedtoprovideameansofcallingoutplasticmaterialsusedinfabricationofenduseitemsorparts.Itisnotintendedfortheselectionofmatierials.Materialselectioncanbemadebythosehavingexpertiseintheplasticsfieldonlyaftercarefulconsiderationofthedesignandtheperformancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,theinherentpropertiesofthematerialotherthanthosecoveredbythisclassificationsystem,andtheeconomics.1.3Thepropertiesincludedinthisclassificationsystemarethoserequiredtoidentifythecompositionscovered.OtherrequirementsnecessarytoidentifyparticularcharacteristicsimportanttospecializedapplicationsaretobecalledoutusingthesuffixesgiveninSection5.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D256TestMethodsforDeterminingtheIzodPendulumImpactResistanceofPlasticsD618PracticeforConditioningPlasticsforTestingD638TestMethodforTensilePropertiesofPlasticsD648TestMethodforDeflectionTemperatureofPlasticsUnderFlexuralLoadintheEdgewisePositionD790TestMethodsforFlexuralPropertiesofUnreinforcedandReinforcedPlasticsandElectricalInsulatingMateri-alsD792TestMethodsforDensityandSpecificGravity(Rela-tiveDensity)ofPlasticsbyDisplacementD883TerminologyRelatingtoPlasticsD1238TestMethodforMeltFlowRatesofThermopla...
