Designation:D5476–99StandardClassificationSystemforThermoplasticPolyurethaneMaterials(TPU)1ThisstandardisissuedunderthefixeddesignationD5476;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThisclassificationsystemandsubsequentlinecalloutisintendedtobeameansofcallingoutthermoplasticpolyurethanematerialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectionshouldbemadebythosehavingexpertiseintheplasticsfieldaftercarefulconsiderationofthedesignandperformancerequiredofthepart,environmenttowhichitwillbeexposed,fabricationprocessestobeused,andinherentpropertiesofthematerialotherthanthosecoveredbythisclassification.1.Scope1.1Thisclassificationsystemcoversthermoplasticpolyure-thanematerialssuitableforinjectionmolding,extrusion,com-pressionmolding,meltprocessing,orotherapplicablemeth-ods.Recycledthermoplasticpolyurethanesmeetingtheclassificationrequirementsmaybeusedinterchangeablywithvirginresin.1.2Thepropertiesincludedinthisclassificationsystemarethoserequiredtoidentifythecompositionscovered.Theremaybeotherrequirementsnecessarytoidentifyparticularcharac-teristicsimportanttospecializedapplications,whichmaybedesignatedbyusingthesuffixesasgiveninSection5.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—TherearenoISOstandardscoveringtheprimarysubjectmatterofthisASTMclassification.2.ReferencedDocuments2.1ASTMStandards:D256TestMethodsforImpactResistanceofPlasticsandElectricalInsulatingMaterials2D412TestMethodsforRubberPropertiesinTension3D618PracticeforConditioningPl...
