Designation:D2970/D2970M−04(Reapproved2014)StandardTestMethodsforTestingTireCords,TireCordFabrics,andIndustrialYarnsMadeFromGlassFilaments1ThisstandardisissuedunderthefixeddesignationD2970/D2970M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthetestingofindustrialyarnsmadeofglassfilaments,cordstwistedfromsuchyarns,andfabricwovenfromsuchcords—productsthataremadespe-cificallyforuseinthemanufactureofpneumatictires.Byagreement,thesetestmethodsmaybeappliedtosimilarglassyarnsandcordsusedforreinforcingotherrubbergoodsandforotherindustrialapplications.Theyarnorcordmaybewoundoncones,tubes,bobbins,spools,orbeams,wovenintofabric,orinotherforms.Thesetestmethodsincludetestingproce-duresonly.Thesetestmethodsdonotincludespecificationsortolerances.1.2Noprocedureisincludedforthedeterminationoffatigueresistanceofcords,butseveralarticlesrelatingtothemeasurementoffatigueresistanceofcordsmadefromman-madefilamentsandcuredinrubberwerepublishedinthebibliographyofTestMethodsD885.1.3Thefollowingsectionsareincluded:SectionAdhesionofCordstoElastomers24BreakingStrength(Force)ofConditionedYarnsandCords13BreakingTenacityofConditionedYarnsandCords14CatenaryLengthofCordsAppendixX1Conditioning8ConstructionofYarnsandCords18CountofTireCordFabric22DipPick-Up(DPU)onYarnsandCords23ElongationatBreakofConditionedYarnsandCords15InitialModulusofConditionedYarnsandCords16Keywords28MassofTireCordFabric22PrecisionandBias25–27SamplingofYarnandCord6SamplingofTireCordFabric7TensilePropertiesofYarnsandCords9–17Terminology3ThicknessofCords21TwistinYarnsandCords20WidthofTireCordFabric22YarnNumberofDippedYarnsandCords191.4ThesetestmethodsshowthevaluesinbothSIunitsandininch-poundunits.“SIunits”isthetechnicallycorrectnameforthesystemofmetricunitsknownastheInternationalSyste...
