Designation:D6662−22StandardSpecificationforPolyolefin-BasedPlasticLumberDeckingBoards1ThisstandardisissuedunderthefixeddesignationD6662;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverspolyolefin-basedplasticlum-berproductsforuseasexteriorresidentialdeckingboards.1.2Plasticlumberproductsarecurrentlymadepredomi-nantlywithrecycledpolyolefinplastics(inparticularhigh-densitypolyethylene)wheretheproductsaremoreorlessnon-homogenousinthecross-section.However,thisspecifica-tionisalsopotentiallyapplicabletosimilarmanufacturedplasticproductsmadefromotherplasticandplasticcompositematerialsthathavenon-homogenouscross-sections.1.3Thisspecificationdetailsaproceduretocalculaterec-ommendedspanlengthsforspacingofsupportjoists.Thisprocedurewasdevelopedusingexperimentaldatafromatypicalunreinforcedplasticlumbermadepredominantlyfromrecycledhigh-densitypolyethylene.Themethodologytode-velopspanlengthsforothertypesandcompositionsofplasticlumberisdetailedinAppendixX1ofthisstandard.1.4Thevaluesarestatedininch-poundunits,asthesearecurrentlythemostcommonunitsusedbytheconstructionindustry.EquivalentSIunitsareindicatedinparentheses.However,theunitsstatedforirradianceexposureintheweatherabilitysection(6.3)areinSIunitsasthesearetheunitscommonlyusedfortestingofthistype.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThereisnosimilarorequivalentISOStandard.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,Guid...
