Designation:D4000−20StandardClassificationSystemforSpecifyingPlasticMaterials1ThisstandardisissuedunderthefixeddesignationD4000;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisstandardprovidesaclassificationsystemfortabu-latingthepropertiesofunfilled,filled,andreinforcedplasticmaterialssuitableforprocessingintoparts.NOTE1—Theclassificationsystemservesmanyoftheneedsofindustriesusingplasticmaterials.Thestandardissubjecttorevisionastheneedrequires;therefore,thelatestrevisionshouldalwaysbeused.1.2Theclassificationsystemandsubsequentlinecall-out(specification)isintendedtobeameansofidentifyingplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectionshouldbemadebythosehavingexpertiseintheplasticsfieldaftercarefulconsiderationofthedesignandtheperformancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,theinherentpropertiesofthematerialnotcoveredinthisdocument,andtheeconomicfactors.1.3Thisclassificationsystemisbasedonthepremisethatplasticmaterialscanbearrangedintobroadgenericfamiliesusingbasicpropertiestoarrangethematerialsintogroups,classes,andgrades.Asystemisthusestablishedwhich,togetherwithvaluesdescribingadditionalrequirements,per-mitsascompleteadescriptionasdesiredoftheselectedmaterial.1.4InallcaseswheretheprovisionsofthisclassificationsystemwouldconflictwiththereferencedASTMspecificationforaparticularmaterial,thelattershalltakeprecedence.NOTE2—Whenusingthisclassificationsystemthetwo-letter,three-digitsuffixsystemapplies.NOTE3—Whenamaterialisusedtofabricateapartwheretherequirementsaretoospecificforabroadmaterialcall-out,itisadvisablefortheusertoconsultthesuppliertosecureacall-ou...
