Designation:D4020−11StandardSpecificationforUltra-High-Molecular-WeightPolyethyleneMoldingandExtrusionMaterials1ThisstandardisissuedunderthefixeddesignationD4020;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationprovidesfortheidentificationofvirgin,naturalcolor,unmodifiedhomopolymerultra-high-molecular-weightpolyethylene(UHMW-PE)plasticsmoldingandextrusionmaterials.Thisidentificationismadeinsuchamannerthatthesellerandpurchasercanagreeontheaccept-abilityofdifferentcommerciallotsorshipments.1.2Thisspecificationalsoprovidesguidanceforthechar-acterizationofUHMWPEmaterialsbasedonvariousmechanical,thermal,electrical,andotheranalyses.1.3Itisnotintendedtodifferentiatebetweenvariousmolecularweightgradesofultra-high-molecular-weightpoly-ethylenecommerciallyavailable.1.4Itisnotthefunctionofthisspecificationtoprovidespecificengineeringdatafordesignpurposes.1.5Ultra-high-molecular-weightpolyethylenes,asdefinedinthisspecification,arethoselinearpolymersofethylenewhichhavearelativeviscosityof1.44orgreater,inaccor-dancewiththetestproceduresdescribedherein.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.7ThefollowingprecautionarycaveatpertainsonlytothetestmethodportionsinSection7andtheAnnexandAppendixes,ofthisspecification:Thisstandarddoesnotpur-porttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThisstandardandISO11542-1addressthesamesubjectmatter,butdifferintechnicalcontent.ISO11542-1providesaclassifica-tionsystembasedonvariouscharacteristicsandarangeo...
