Designation:D4441−20StandardSpecificationforAqueousDispersionsofPolytetrafluoroethylene1ThisstandardisissuedunderthefixeddesignationD4441;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversaqueousdispersionsofpoly-tetrafluoroethylene(PTFE)resins.Theseresinsarehomopoly-mersoftetrafluoroethylene,orinsomecasesmodifiedho-mopolymerscontainingnotmorethan1%byweightofotherfluoromonomers.1.1.1Thedispersionisusuallystabilizedbyoneormoresurfactants.Othernon-PTFEmaterialsmaybepresentintotalat5%orlessbyweightforspecialpurposes.1.1.2Thisspecificationisforvirginmaterialonlyanddoesnotaddressrecycledmaterialasitisnotappropriatefordispersions.1.2Thisspecificationisusedtodetermineifashipment,lot,orcontainerofPTFEdispersionissuitableforitsintendeduse.Itcoversonlyaqueousdispersionsofpolytetrafluoroethylene.ItdoesnotcoverPTFEcopolymersorfilleddispersions.ThisspecificationincludestestmethodsforbothaqueousdispersionandthePTFEinthedispersion.NOTE1—UsesforthePTFEdispersioncoveredbythisspecificationinclude,butarenotlimitedto,castingoftheirfilms,impregnationofmechanicalpackingsandothermaterials,surfacecoatingsonvarioussubstrates,combinedimpregnationandcoatingoffibrousmaterials,andco-coagulationwithothermaterialsforsubsequentprocessingintofilms,sheets,rods,andtubes.NOTE2—InformationinthisspecificationistechnicallyequivalenttorelatedinformationinISO20568-1andISO20568-2.1.3ThevaluesstatedinSIunitsasdetailedinIEEE/ASTMSI-10aretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thefollowingprecautionarycaveatpertainsonlytothetestmethodportionsofthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpractices...
