Designation:D2646−18StandardGuideforBackingFabricCharacteristicsofPileYarnFloorCoverings1ThisstandardisissuedunderthefixeddesignationD2646;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstheprocedureslistedasfollowsfortestingwoven,knittedandnonwovenbackingfabricsdesignedforuseinthemanufactureofpileyarnfloorcoverings.Theproceduresappearinthefollowingorder:SectionBowandSkewnessofWovenFabrics8BreakingForceofWovenandNonwovenFabrics15BreakingForceAfterTuftingofWovenandNonwovenFabrics16ExtractableMatter9FabricCountofWovenFabrics12FabricCountofKnittedFabrics13LengthofWovenFabrics11MassperUnitArea(Weight)ofWovenFabrics14WidthofWovenFabrics101.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1776PracticeforConditioningandTestingTextilesD2257TestMethodforExtractableMatterinTextilesD3773TestMethodsforLengthofWovenFabricD3774TestMethodforWidthofTextileFabricD3775TestMethodforEnd(Warp)andPick(Filling)CountofWovenFabricsD3776TestMethodsforMassPerUnitArea(Weight)ofFabricD3882TestMethodforBowandSkewinWovenandKnitte...
