Designation:D2581−09StandardClassificationSystemforPolybutylene(PB)PlasticsMoldingandExtrusionMaterials1ThisstandardisissuedunderthefixeddesignationD2581;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisclassificationsystemcoverspolybutyleneplasticsmaterialssuitableformoldingandextrusion.1.2Thisclassificationsystemisapplicabletoallbutenehomopolymersandtocopolymersofbutenewithamaximumcontentofother1-olefinicmonomersoflessthan50%andwithacontentofnon-olefinicmonomerswithfunctionalgroupsuptoamaximumof1%.1.3Thisclassificationsystemallowsfortheuseofthosepolybutyleneplasticmaterialsthataretoberecycled,reconstituted,andreground,providedthefollowingconditionsaremet:1.3.1Therequirementsasstatedinthisclassificationsystemandotherguidelinepertainingtothesematerialsaremet,and1.3.2Thematerialhasnotbeenmodifiedinanywaytoalteritsconformancetowatercontactregulationsorothersimilarrequirements.1.4Theproportionsofrecycled,reconstituted,andregrindmaterialused,aswellasthenatureandtheamountofanycontaminant,cannotbepracticallycoveredinthisclassificationsystem.Itistheresponsibilityofthesupplierandbuyerofrecycled,reconstituted,andregrindmaterialstoensurecom-pliance.1.5Thepropertiesincludedinthisclassificationsystemarethoserequiredtocharacterizeandclassifythespecificproduct.Otherpropertiesarenecessarytoidentifyparticularcharacter-isticsimportanttospecializedapplications.ThesearespecifiedbyusingsuffixesasgiveninSection5.Propertiesshallbeselectedinsuchamannerthatconsistencyofdifferentlotsorshipmentsisassured.Thetestsinvolvedinthisclassificationsystemareintendedtoprovideinformationforidentifyingmaterialsinaccordancewithtypesandcategories.Itisnotthefunctionofthisclassificationsystemtoprovidespecificengi-neeringdatafordesignpurposes.1.6Thisclassificationsystemandsubsequentlin...
