ASTM D4975 - 14

    Standard Test Methods for Single-Filament Tire Bead Wire Made from Steel

    Active Standard ASTM D4975 | Developed by Subcommittee: D13.19

    Book of Standards Volume: 07.02


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    Significance and Use

    5.1 The procedures for the determination of properties of single-filament bead wire made from steel are considered satisfactory for acceptance testing of commercial shipments of this product because the procedures are the best available and have been used extensively in the trade.

    5.1.1 In case of a dispute arising from differences in reported test results when using these test methods for acceptance testing of commercial shipments, the purchaser and supplier should conduct comparative test 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 which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens then should be randomly assigned in equal number to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found, either its cause must be determined and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.

    1. Scope

    1.1 These test methods cover testing of single-filament steel wires that are components of tire beads used in the manufacture of pneumatic tires. By agreement, these test methods may be applied to similar filaments used for reinforcing other rubber products.

    1.2 These test methods describe test procedures only and do not establish specifications and tolerances.

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

    1.4 These test methods cover the determination of the mechanical properties listed below:

     

    Property  

    Section

     

     

    Breaking Force (Strength)

     7 – 13

     

    Yield Strength

     7 – 13

     

    Elongation

     7 – 13

     

    Torsion Resistance

    14 – 20

     

    Diameter (Gage)

    21 – 27


    1.5 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.


    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

    D123 Terminology Relating to Textiles

    D4848 Terminology Related to Force, Deformation and Related Properties of Textiles

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


    ICS Code

    ICS Number Code 77.140.65 (Steel wire, wir ropes and link chains); 83.160.10 (Road vehicle tyres)

    UNSPSC Code

    UNSPSC Code 25172507(Tire cord); 31152200(Non electric iron and steel wire)


    DOI: 10.1520/D4975-14

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