ASTM D2969 - 04(2014)

    Standard Test Methods for Steel Tire Cords

    Active Standard ASTM D2969 | Developed by Subcommittee: D13.19

    Book of Standards Volume: 07.01


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    Significance and Use

    5.1 The procedures in Test Methods D2969 for the determination of the properties of steel tire cord and related materials are considered satisfactory for acceptance testing of commercial shipments of such products because the procedures are the best available and have been used extensively in the trade. When a purchaser frequently uses a specific supplier, it is recommended that the two parties investigate the methods to determine if there is any bias between their two laboratories as directed in 5.1.1.

    5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. Test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun. If bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.

    5.2 The significance and use of particular properties are discussed in the appropriate sections.

    1. Scope

    1.1 These test methods cover the testing of cords made from steel that are specifically designed for use in the reinforcement of pneumatic tires. By agreement, these test methods may be used to test similar cords or filaments used for reinforcing other rubber products. The steel cords may be wound on spools or beams. The steel cords may also be woven into fabric, in which case they must be removed from the fabric prior to testing.

    Note 1For other methods of testing tire cords and tire cord fabrics, refer to Methods D885, Test Methods D1871, Specifications D122, and Test Methods D2692 and D2970/D2970M. For tolerances on tire cords and tire cord fabrics, refer to Specifications D122 and Methods D885.

    1.2 These test methods include test procedures only; they do not establish specifications or tolerances.

    1.3 This test method includes the following sections:

    Subject

    Section

    Adhesion of Steel Cords and Filaments to Elastomers

    16

    Brass Coating Composition and Mass

    14, 15

    Breaking Force (Strength)

    10

    Construction

    12

    Data Form for Reporting Test Results

    Appendix X1

    Elongation at Break

    10

    Elongation Between Defined Forces (EDF)

    11

    Flare

    8

    Lay

    12

    Linear Density

    9

    Visual Appearance

    8

    Nomenclature System

    Annex A1

    Residual Torsions

    8

    Straightness

    8

    Thickness and Out-of-Roundness

    13


    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See 14.3 and Note 11.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D76 Specification for Tensile Testing Machines for Textiles

    D122 Tolerances for Tire Fabrics Other Than Tire Cord Fabrics

    D123 Terminology Relating to Textiles

    D885 Test Methods for Tire Cords, Tire Cord Fabrics, and Industrial Filament Yarns Made from Manufactured Organic-Base Fibers

    D1871 Test Method for Adhesion Between Tire Bead Wire and Rubber

    D2229 Test Method for Adhesion Between Steel Tire Cords and Rubber

    D2692 Test Method for Air Wicking of Tire Fabrics, Tire Cord Fabrics, Tire Cord, and Yarns

    D2904 Practice for Interlaboratory Testing of a Textile Test Method that Produces Normally Distributed Data

    D2970/D2970M Test Methods for Testing Tire Cords, Tire Cord Fabrics, and Industrial Yarns Made From Glass Filaments

    D4393 Test Method for Strap Peel Adhesion of Reinforcing Cords or Fabrics to Rubber Compounds

    D6477 Terminology Relating to Tire Cord, Bead Wire, Hose Reinforcing Wire, and Fabrics

    E663 Practice for Flame Atomic Absorption Analysis


    ICS Code

    ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains); 83.160.01 (Tyres in general)

    UNSPSC Code

    UNSPSC Code 25172507(Tire cord)


    DOI: 10.1520/D2969-04R14

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