Designation:D4895−18StandardSpecificationforPolytetrafluoroethylene(PTFE)ResinProducedFromDispersion1ThisstandardisissuedunderthefixeddesignationD4895;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecification2coverspolytetrafluoroethylene(PTFE)preparedbycoagulationofadispersion.ThesePTFEresinsarehomopolymersoftetrafluoroethyleneormodifiedhomopolymerscontainingnotmorethan1%byweightofotherfluoromonomers.ThematerialscoveredhereindonotincludemixturesofPTFEwithadditivessuchascolors,fillers,orplasticizers;nordotheyincludereprocessedorregroundresinoranyfabricatedarticlesbecausethepropertiesofsuchmaterialshavebeenirreversiblychangedwhentheywerefibrillatedorsintered.1.2ThevaluesstatedinSIunitsasdetailedinIEEE/ASTMSI-10aretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.3ThefollowingsafetyhazardscaveatpertainsonlytotheSpecimenPreparationSection,Section9,andtheTestMethodsSection,Section10,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SeeWarningnotein9.1.1foraspecifichazardsstatement.NOTE1—InformationinthisspecificationistechnicallyequivalenttorelatedinformationinISO20568-1andISO20568-2.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D618PracticeforConditioningPlasticsforTesti...
