Designation:D7436−17StandardClassificationSystemforUnfilledPolyethylenePlasticsMoldingandExtrusionMaterialswithaFractionalMeltIndexUsingISOProtocolandMethodology1ThisstandardisissuedunderthefixeddesignationD7436;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThismaterialspecificationisintendedtoprovideacalloutsystemforpolyethyleneutilizingspecimenpreparationproceduresandtestmethodsbasedprimarilyonISOstandards.1.Scope*1.1Thisclassificationsystemprovidesfortheidentificationofunfilledpolyethyleneplasticsmoldingandextrusionmaterials,withameltindexof<1g/10min,insuchamannerthatthesupplierandtheuseragreeontheacceptabilityofdifferentcommerciallotsorshipments.Thetestsinvolvedinthisspecificationareintendedtoprovideinformationforidentifyingmaterialsinaccordancewiththegroups,classes,andgradescovered.Itisnotthefunctionofthisclassificationsystemtoprovidespecificengineeringdatafordesignpur-poses.1.2Thisclassificationsystemallowsfortheuseofrecycledpolyethylenematerialsprovidedthattherequirementsasstatedinthisclassificationsystemaremet.Theproportionsofrecycledmaterialused,aswellasthenatureandamountofanycontaminant,however,willnotbecoveredinthisspecification.NOTE1—SeeGuideD7209forinformationanddefinitionsrelatedtorecycledplastics.1.3Thepropertiesincludedinthisclassificationsystemarethoserequiredtoidentifythecompositionscovered.Theremaybeotherrequirementsnecessarytoidentifyparticularcharac-teristicsimportanttospecializedapplications.TheseshallbeagreeduponbetweentheuserandthesupplierbyusingthesuffixesgiveninSection5.1.4Thisclassificationsystemandsubsequentlinecallout(specifications)areintendedtoprovideameansofcallingoutplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectionshouldbemadebythosehavingexpertis...
