Designation:D7570−17(Reapproved2021)´1StandardTestMethodforEvaluationofDimensionalStabilityofPileYarnFloorCovering1ThisstandardisissuedunderthefixeddesignationD7570;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—ResearchreportinformationwasaddedtoSection15editoriallyinAugust2021.1.Scope1.1Thistestmethodcoversthedeterminationofdimen-sionalchangesinthelengthwiseandwidth-wisedirectionanddistortionlikelytooccurwhenpilefloorcoveringsareexposedtovariousconditionsofmoistureandheat.Thismethodisapplicabletoallpilefloorcoveringsincludingcarpetmoduleform.1.2Thismethodisapplicabletomachinemadepileyarnfloorcovering.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversiontoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1776/D1776MPracticeforConditioningandTestingTex-tilesD5684TerminologyRelatingtoPileFloorCoveringsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1ForallterminologyrelatingtoD13.21,PileYarnFloorCoverings,refertoTerminologyD5684.3.2Thefollowingtermsarerelevan...
