ASTM_D_2970_-_D_2970M_-_04_2014.pdf

Designation:D2970/D2970M04(Reapproved 2014)Standard Test Methods forTesting Tire Cords,Tire Cord Fabrics,and Industrial YarnsMade From Glass Filaments1This standard is issued under the fixed designation D2970/D2970M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the testing of industrial yarnsmade of glass filaments,cords twisted from such yarns,andfabric woven from such cordsproducts that are made spe-cifically for use in the manufacture of pneumatic tires.Byagreement,these test methods may be applied to similar glassyarns and cords used for reinforcing other rubber goods and forother industrial applications.The yarn or cord may be woundon cones,tubes,bobbins,spools,or beams,woven into fabric,or in other forms.These test methods include testing proce-dures only.These test methods do not include specifications ortolerances.1.2 No procedure is included for the determination offatigue resistance of cords,but several articles relating to themeasurement of fatigue resistance of cords made from man-made filaments and cured in rubber were published in thebibliography of Test Methods D885.1.3 The following sections are included:SectionAdhesion of Cords to Elastomers24Breaking Strength(Force)of Conditioned Yarns and Cords13Breaking Tenacity of Conditioned Yarns and Cords14Catenary Length of CordsAppendix X1Conditioning8Construction of Yarns and Cords18Count of Tire Cord Fabric22Dip Pick-Up(DPU)on Yarns and Cords23Elongation at Break of Conditioned Yarns and Cords15Initial Modulus of Conditioned Yarns and Cords16Keywords28Mass of Tire Cord Fabric22Precision and Bias25 27Sampling of Yarn and Cord6Sampling of Tire Cord Fabric7Tensile Properties of Yarns and Cords9 17Terminology3Thickness of Cords21Twist in Yarns and Cords20Width of Tire Cord Fabric22Yarn Number of Dipped Yarns and Cords191.4 These test methods show the values in both SI units andin inch-pound units.“SI units”is the technically correct namefor the system of metric units known as the InternationalSystem of Units.“Inch-pound units”is the technically correctname for the customary units used in the United States.Thevalues stated in either acceptable metric units or other unitsshall be regarded separately as standard.The values expressedin each system may not be exact equivalents;therefore,eachsystem must be used independently of each other withoutcombining values in any way.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD578 Specification for Glass Fiber StrandsD885 Test Methods for Tire Cords,Tire Cord Fabrics,andIndustrial Filament Yarns Made from ManufacturedOrganic-Base FibersD1423 Test Method for Twist in Yarns by Direct-CountingD2258 Practice for Sampling Yarn for TestingD4393 Test Method for Strap Peel Adhesion of ReinforcingCords or Fabrics to Rubber CompoundsD4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD6477 Terminology Relating to Tire Cord,Bead Wire,HoseReinforcing Wire,and Fabrics3.Terminology3.1 Definitions:3.1.1 For definitions of terms related to tire cord,bead wire,hose wire,and tire cord fabrics,refer to Terminology D6477.1These test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.19 on IndustrialFibers and Metallic Reinforcements.Current edition approved May 15,2014.Published June 2014.Originallyapproved in 1980.Last previous edition approved in 2010 as D2970/D2970M 04(2010).DOI:10.1520/D2970_D2970M-04R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1.1 The following terms are relevant to this standard”catenary length,cord twist,dip,dip pickup,in textile cord orfabric,industrial yarn,standard atmosphere for testing textiles,tabby sample,tire cord,and tire cord fabric.3.1.2 For definitions of terms related to force and deforma-tion in textiles,refer to Terminology D4848.3.1.2.1 The following terms are relevant to this standard:breaking force,breaking tenacity,initial modulus,tensilestrength.3.1.3 For definitions of other terms related to textiles,referto Terminology D123.3.1.3.1 The following