ASTM-D885 – Standard Test Methods for Tire Cords, Tire Cord Fabrics, and Industrial Filament Yarns Made from Manufactured Organic-Base Fibers
Significance and Use
The procedures in these test methods should be used with caution for acceptance of commercial shipments owing to the absence of factual information on the between-laboratory precision of many of the test procedures included in these test methods. It is recommended that any program of acceptance testing be preceded by an interlaboratory check in the laboratory of the purchaser and the laboratory of the supplier on replicate specimens of the materials to be tested for each property (or properties) to be evaluated.
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 must be adjusted in consideration of the known bias.
The significance and use of particular properties are discussed in the appropriate sections of specific test methods.
These test methods cover the testing of industrial filament yarns made wholly of manufactured organic-base fibers, cords twisted from such yarns, fabrics woven from such cords, and products that are made specifically for use in the manufacture of pneumatic tires. They may be applied to similar yarns and cords used for reinforcing other rubber goods and for other industrial applications. The test methods apply to nylon, polyester, and rayon yarns and tire cords twisted from such yarns and to fabrics made from such cords. The yarn or cord may be wound on cones, tubes, bobbins, spools, or beams; may be woven into fabric; or may be in some other form. The methods include testing procedure only and include no specifications or tolerances.
No procedure is included for the determination of fatigue resistance of cord, but several commonly used procedures for the measurement of fatigue resistance of cords in rubber were published in the appendix of these test methods in the 1967 Annual Book of ASTM Standards, Part 24, and in earlier issues of Test Methods D885.
The sections on “Growth of Conditioned Yarns and Cords,” “Properties of Yarns and Cords at Elevated Temperature,” and “Properties of Wet Yarns and Cords” have been moved to Appendix X1 – Appendix X3 as non-mandatory informational items because of their very limited use by the industry and because precision and bias statements are not included.
This standard includes the following sections:
Adhesion of Cord to Elastomers
Bibliography of Tire Cord Test Methods
Breaking Strength (Force) of Yarns and Cords at Elevated Tempera- ture
Breaking Strength (Force) of Conditioned Yarns and Cords
Breaking Strength (Force) of Oven-Dried Rayon Yarns and Cords
Breaking Strength (Force) of Rayon Yarns and Cords at Specified Moisture Regain Level, Adjustment of
Breaking Tenacity of Conditioned Yarns and Cords
Breaking Tenacity of Oven-Dried Rayon Yarns and Cords
Breaking Toughness of Yarns and Cords
Contraction of Wet Yarns and Cords
Count of Tire Cord Fabric
Dip (Adhesive) Solids Pickup on Yarns and Cords
Elongation at Break of Conditioned Yarns and Cords
Elongation at Break of Oven-Dried Rayon Yarns and Cords
Elongation of Rayon Yarns and Cords at a Specified Moisture Regain Level, Adjustment of Observed
Extractable Matter in Yarns and Cords
Force at Specified Elongation (FASE) of Conditioned Yarns and Cords
Force at Specified Elongation (FASE) of Oven-Dried Rayon Yarns and Cords
Growth of Conditioned Yarns and Cords
Identification of Fibers
Mass of per Unit Area of Tire Cord Fabric
Modulus of Conditioned Yarns and Cords
Moisture Regain, Actual
Precision and Bias of Certain Yarn and Cord Tests
Properties of Tire Cord Fabric
Shrinkage Force of Conditioned Yarns and Cords at Elevated Temper- ature
Shrinkage of Conditioned Yarns and Cords at Elevated Temperature
Significance and Use, General
Significance and Use, Tensile Properties
SI Calculations (examples for work-to-break, specific work-to-break, and breaking toughness)