Designation:D6644−01(Reapproved2021)StandardTestMethodforTensionStrengthofSew-ThroughFlangeButtons1ThisstandardisissuedunderthefixeddesignationD6644;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodmeasurestheresistanceofthebridgeofasew-throughbuttontoasteadilyincreasingstrain.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandard:2D618PracticeforConditioningPlasticsforTestingD5497TerminologyRelatingtoButtons(Withdrawn2011)33.Terminology3.1Forbuttondefinitions,refertoTerminologyD5497.4.SummaryofTestMethod4.1Thesew-throughflangebuttonissewnontofabricandpositionedinaclampingfixture.Thecombinationissubjectedtoastrainrecordedonaforcegauge.4.2Testsaremadeonsewthroughflangebuttonsbeforelaunderingordrycleaningwiththeoptionoftestingagainafterapredeterminednumberoflaunderingsordrycleanings.5.SignificanceandUse5.1Thistestmeasuresanimportantpropertytousersofsewthroughflangebuttons.Thisisameansofdeterminingtheresistanceofthebridgeofthebuttontoastrainwhichc...
