Designation:D8156−18StandardClassificationSystemforandBasisofSpecificationsforThermoplasticElastomerCopolyesterMoldingandExtrusionMaterials(TPC)1ThisstandardisissuedunderthefixeddesignationD8156;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationsystemcoverssegmentedblockco-polyesterelastomerssuitableformoldingandextrusion.1.2Thisclassificationsystemallowsfortheuseofseg-mentedblockcopolyestherelastomersthatarerecycledpro-videdthattherequirementsasstatedinthisclassificationsystemaremet.Theproportionsofrecycledmaterialused,aswellasthenatureandamountofanycontaminant,however,cannotbecoveredpracticallyinthisspecification.1.3Thepropertiesincludedinthisclassificationsystemarethoserequiredtoidentifythecompositionscovered.Itispossiblethatthereareotherrequirementsnecessarytoidentifyparticularcharacteristicsimportanttospecializedapplications.OnewayofspecifyingthemisbyusingthesuffixesasgiveninSection5.1.4Thisclassificationsystemandsubsequentlinecallout(specification)areintendedtoprovideameansofcallingoutplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectionisbestmadebythosehavingexpertiseintheplasticfieldaftercarefulconsiderationofthedesignandtheperfor-mancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,thecostsinvolved,andtheinherentpropertiesofthematerialotherthanthosecoveredbythisclassificationsystem.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section11,ofthisclassificationsystem.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestabl...
