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Significance and Use

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.

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.

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 , and Test Methods D2692 and D2970/D2970M . For tolerances on tire cords and tire cord fabrics, refer to Specifications and Methods D885 .

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

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

Keywords

adhesion; brass coating; direction of lay; elongation; linear density; steel cord; strength, breaking; thickness; visual appearance; Stiffness--textile materials/applications; Tensile properties/testing--textile materials/applications; Thickness--textile fabrics/fibers; Tire cords and tire cord fabrics; Visual examination--textiles; Zinc content; Adhesion; Brass electrodeposition; Breaking strength/tenacity--textile fabrics/fibers; Copper content--steel; Density--linear; Elongation--textiles; Rubber adhesion; Steel cords; Steel wire strand;

ICS Code

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

DOI: 10.1520/D2969-04R10

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ASTM D2969