Значение и использование

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.

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 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.

Область применения

1.1 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.

1.2 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 D 885.

1.3 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 as non-mandatory informational items because of their very limited use by the industry and because precision and bias statements are not included.

1.4 This standard includes the following sections:

SectionAdhesion of Cord to Elastomers34Bibliography of Tire Cord Test MethodsX5Breaking Strength (Force) of Yarns and Cords at Elevated Tempera-tureX2.3Breaking Strength (Force) of Conditioned Yarns and Cords16Breaking Strength (Force) of Oven-Dried Rayon Yarns and Cords23Breaking Strength (Force) of Rayon Yarns and Cords at SpecifiedMoisture Regain Level, Adjustment of17Breaking Tenacity of Conditioned Yarns and Cords18Breaking Tenacity of Oven-Dried Rayon Yarns and Cords24Breaking Toughness of Yarns and Cords28Commercial Mass9Conditioning7Contraction of Wet Yarns and CordsX3Count of Tire Cord Fabric37Dip (Adhesive) Solids Pickup on Yarns and Cords33Elongation at Break of Conditioned Yarns and Cords19Elongation at Break of Oven-Dried Rayon Yarns and Cords25Elongation of Rayon Yarns and Cords at a Specified Moisture RegainLevel, Adjustment of Observed20Extractable Matter in Yarns and Cords32Force at Specified Elongation (FASE) of Conditioned Yarns andCords21Force at Specified Elongation (FASE) of Oven-Dried Rayon Yarns andCords26Growth of Conditioned Yarns and CordsX1Identification of Fibers8Keywords40Linear Density11Mass of per Unit Area of Tire Cord Fabric36Modulus of Conditioned Yarns and Cords22Moisture Regain, Actual10Precision and Bias of Certain Yarn and Cord Tests3935 toProperties of Tire Cord Fabric38Sampling6Shrinkage Force of Conditioned Yarns and Cords at Elevated Temper-atureX2.5Shrinkage of Conditioned Yarns and Cords at Elevated TemperatureX2.4Significance and Use, General5Significance and Use, Tensile Properties14SI Calculations (examples for work-to-break, specific work-to-break,and breaking toughness)X4Stiffness of Fabric3812 to Tensile Properties of Yarns and Cords28Terminology3Thickness of Cords31Twist in Yarns and Cords30Width of Tire Cord Fabric35Work-to-Break of Yarns and Cords27

1.5 These test methods show the values in both SI and 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.

1.6 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.