Designation:D6778−14StandardClassificationSystemandBasisforSpecificationforPolyoxymethyleneMoldingandExtrusionMaterials(POM)1ThisstandardisissuedunderthefixeddesignationD6778;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisclassificationsystemcoverspolyoxymethylenema-terialssuitableformoldingandextrusion.Thisclassificationsystemallowsfortheuseofpolyoxymethyleneplasticmate-rialsthatarerecycled,reconstituted,recycled-regrind,recovered,orreprocessed,orcombinationthereof,providedthattherequirementsasstatedinthisspecificationaremet.Itistheresponsibilityofthesupplierandthebuyerofrecycled,reconstituted,recycled-regrind,recovered,orreprocessedpolyoxymethyleneplasticmaterials,orcombinationthereof,toensurecompliance.(SeeGuideD7209).1.2Thepropertiesincludedinthisstandardarethoserequiredtoidentifythecompositionscovered.Otherrequire-mentsnecessarytoidentifyparticularcharacteristicsimportanttospecializedapplicationsaretobespecifiedbyusingsuffixesasgiveninSection5.1.3Thisclassificationsystemandsubsequentlinecallout(specification)areintendedtoprovideameansofcallingoutplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectioncanbemadebythosehavingexpertiseintheplasticfieldonlyaftercarefulconsiderationofthedesignandtheperformancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,thecostsinvolved,andtheinherentpropertiesofthematerialotherthanthosecoveredbythisstandard.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodportion,Section11,ofthisclassificationsystem.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associate...
