Область применения

1.1 These test methods cover the testing of both round extruded latex and rectangular cut rubber thread products in which the base material used in manufacture may be natural rubber or synthetic rubber, alone or in combination. These tests are to be made only on the bare uncovered rubber thread.

1.2 Owing to the comparatively small cross section of the material and also because of the unusual conditions of service of this material, certain special test methods have been developed and take the place of the tests for other rubber products.

1.3 Comparisons may only be made on new rubber threads or those of identical processing histories. In the interpretation of results from threads which have been subjected to spooling, fabrication, or other process, the previous history is important, and what is known of this and any relaxation treatments used should be stated.

1.4 The test methods appear in the following sections:

Sections Density 7 to 11 Count 12 to 16 Metric Yield (Length per Unit Weight) 17 to 19 Tensile Strength 20 to 22 Elongation at Break 23 and 24 Stress at Predetermined Elongation 25 to 27 Elongation Under Fixed Force (Method A) 28 to 30 Elongation Under Fixed Force (Method B) 31 to 34 Stress Retention 35 to 39

1.5 This standard does not purport to address all of the safety problems, 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.