Designation:D6779−21StandardClassificationSystemforandBasisofSpecificationforPolyamideMoldingandExtrusionMaterials(PA)1ThisstandardisissuedunderthefixeddesignationD6779;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisclassificationsystemcoverspolyamidematerialssuitableformoldingandextrusion.Someofthesecomposi-tionsarealsosuitableforapplicationfromsolution.1.2Thepropertiesincludedinthisclassificationsystemarethoserequiredtoidentifythecompositionscovered.OtherrequirementsnecessarytoidentifyparticularcharacteristicsimportanttospecializedapplicationsaretobespecifiedbyusingsuffixesasgiveninSection5.1.3Thisclassificationsystemandsubsequentlinecallout(specification)areintendedtoprovideameansofcallingoutplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectioncanbemadebythosehavingexpertiseintheplasticfieldaftercarefulconsiderationofthedesignandtheperfor-mancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,thecostsinvolved,andtheinherentpropertiesofthematerialotherthanthosecoveredbythisclassificationsystem.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section11,ofthisclassificationsystem.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalpracticesanddeterminetheappli-cabilityofregulatorylimitationspriortouse.NOTE1—ThisclassificationsystemissimilartoISO16396-1⁄-2,althoughthetechnicalcontentissignificantlydifferent.1.6Thisinternati...
