Designation:D6612−00(Reapproved2022)StandardTestMethodforYarnNumberandYarnNumberVariabilityUsingAutomatedTester1ThisstandardisissuedunderthefixeddesignationD6612;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofyarnnumberupto4000dtex(3600denier)andrelatedvariabilitypropertiesoffilamentandspunyarnsusinganautomatedtesterwithcapabilityformeasuringmassvariabilitycharacteristics.1.2Yarnnumbervariabilitypropertiesincludepercentden-sityspread(%DS),coefficientofvariation(%CV),densityfrequencyvariation.NOTE1—Fordeterminationofyarnnumberbyuseofreelandbalance,refertoTestMethodD1907.Foranothermethodofmeasuringvariability(unevenness)inyarn,refertoTestMethodD1425.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;thereforetoensureconformancewiththisstandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1425TestMethodforEvennessofTextileStrandsUsingCapacitanceTestingEquipmentD1776PracticeforConditioningandTestingTextilesD1907TestMethodforLinearDensityofYarn(YarnNum-ber)bytheSkeinMethodD...
