BS ISO 2321:2017,Rubber threads — Methods of test.This standard is from the Internet.You can download it for free.
ISO 2321:2017 specifies methods of test for determining general physical and mechanical properties of rubber threads, as well as specific mechanical properties of such threads in contact with fabrics.
Conditioning of samples or test pieces
The samples or test pieces shall be kept in a relaxed state in one of the standard atmospheres described in ISO 23529, for not less than 16 h before testing. The tests shall be carried out under similar atmospheric conditions. The test piece selected shall be clean, dry and free from any visual defects.Samples or test pieces shall not be allowed to come into contact with copper or manganese of their compounds during conditioning or testing.
The essential requirements are that the apparatus is capable of stretching a test piece at a constant speed until the load reaches a predetermined value, and that it incorporates a graduated scale for reading the elongation.