Designation:D3935−21StandardClassificationSystemandBasisforSpecificationforPolycarbonate(PC)UnfilledandReinforcedMaterial1ThisstandardisissuedunderthefixeddesignationD3935;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisclassificationsystemcoversunfilledandreinforcedpolycarbonateandpolycarbonatecopolymermaterialssuitableforinjectionmolding,blowmolding,andextrusion.Someofthesecompositionsmayalsofinduseforcompressionmoldingorapplicationfromsolution.Thisclassificationsystemallowsfortheuseofrecycledmaterialsprovidedthatallspecificationrequirementsaremet.1.2Thepropertiesinthisclassificationsystemarethoserequiredforidentifyingthecompositionscovered.Otherre-quirementsnecessaryforidentifyingparticularcharacteristicsimportanttospecificapplicationsarenormallyspecifiedbyusingthesuffixesinaccordancewithSection5.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisclassificationsystemandsubsequentlinecallout(specification)areintendedtoprovideameansofcallingoutplasticmaterialsusedinthefabricationofenditemsorparts.Itisnotintendedfortheselectionofmaterials.Materialselectionshouldbemadebythosehavingexpertiseintheplasticfieldonlyafterconsiderationofthedesignandtheperformancerequiredofthepart,theenvironmenttowhichitwillbeexposed,thefabricationprocesstobeemployed,thecostsinvolved,andtheinherentpropertiesofthematerialotherthanthosecoveredinthisstandard.NOTE1—ThisclassificationsystemandISO21305-1andISO21305-2addressthesamesubjectmatter,butdifferintechnicalcontent.1.5Thefollowingprecautionarycaveatpertainsonlytothetestmethodsportion,Section12,ofthisclassificationsys-tem.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,ass...
