ASTM-D2970 › Standard Test Methods for Testing Tire Cords, Tire Cord Fabrics, and Industrial Yarns Made From Glass Filaments (Withdrawn 2023)

ASTM-D2970 - 2004 R14 EDITION - CANCELLED
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Standard Test Methods for Testing Tire Cords, Tire Cord Fabrics, and Industrial Yarns Made From Glass Filaments (Withdrawn 2023)
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Scope

1.1 These test methods cover the testing of industrial yarns made of glass filaments, cords twisted from such yarns, and fabric woven from such cords—products that are made specifically for use in the manufacture of pneumatic tires. By agreement, these test methods may be applied to similar glass yarns and cords used for reinforcing other rubber goods and for other industrial applications. The yarn or cord may be wound on cones, tubes, bobbins, spools, or beams, woven into fabric, or in other forms. These test methods include testing procedures only. These test methods do not include specifications or tolerances.

1.2 No procedure is included for the determination of fatigue resistance of cords, but several articles relating to the measurement of fatigue resistance of cords made from man-made filaments and cured in rubber were published in the bibliography of Test Methods D885.

1.3 The following sections are included:

 

Section

Adhesion of Cords to Elastomers

24

Breaking Strength (Force) of Conditioned Yarns and Cords

13

Breaking Tenacity of Conditioned Yarns and Cords

14

Catenary Length of Cords

Appendix X1

Conditioning

8

Construction of Yarns and Cords

18

Count of Tire Cord Fabric

22

Dip Pick-Up (DPU) on Yarns and Cords

23

Elongation at Break of Conditioned Yarns and Cords

15

Initial Modulus of Conditioned Yarns and Cords

16

Keywords

28

Mass of Tire Cord Fabric

22

Precision and Bias

25 – 27

Sampling of Yarn and Cord

6

Sampling of Tire Cord Fabric

7

Tensile Properties of Yarns and Cords

9 – 17

Terminology

3

Thickness of Cords

21

Twist in Yarns and Cords

20

Width of Tire Cord Fabric

22

Yarn Number of Dipped Yarns and Cords

19


1.4 These test methods show the values in both SI units and in inch-pound units. “SI units” is the technically correct name for the system of metric units known as the International System of Units. “Inch-pound units” is the technically correct name for the customary units used in the United States. The values stated in either acceptable metric units or other units shall be regarded separately as standard. The values expressed in each system may not be exact equivalents; therefore, each system must be used independently of each other without combining values in any way.

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.

Significance and Use

5.1 The procedures in these test methods may be used for the acceptance testing of commercial shipments, but caution is advised because technicians may fail to get good agreement between results on certain yarns, cords, or fabrics. Comparative tests as directed in Section 5.1.1 may be advisable.

5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other materials with established test values may be used for this purpose. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.

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

Keywords

catenary length; dip pick-up; fabric; glass; glass fibers; industrial yarn; tensile properties/tests; tire cord

To find similar documents by ASTM Volume:

07.01 (Textiles (I): D76 - D4391)

To find similar documents by classification:

83.160.01 (Tyres in general)

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Document Number

ASTM-D2970/D2970M-04(2014)

Revision Level

2004 R14 EDITION

Status

Cancelled

Modification Type

Withdrawn

Publication Date

June 15, 2014

Document Type

Test Method

Page Count

10 pages

Committee Number

D13.19