ISO 2321:2017
(Main)Rubber threads — Methods of test
Rubber threads — Methods of test
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. Owing to the comparatively small cross-section and the unusual conditions of service of this material, certain special methods have been developed. Some of the tests included in this document are not entirely suitable for threads made from certain synthetic rubbers (e.g. urethane rubber). These tests are intended for natural or synthetic polyisoprene rubbers. Comparisons can only be made on new rubber threads or on those with identical processing histories. In the interpretation of results from threads which have been subjected to spooling, fabrication or any other process, the previous history is important, and what is known of this and of any relaxation treatments used is intended to be reported.
Fils élastiques — Méthodes d'essai
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 2321
Fourth edition
2017-08
Rubber threads — Methods of test
Fils élastiques — Méthodes d'essai
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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Contents Page
Foreword .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Conditioning of samples or test pieces . 3
5 Count . 3
5.1 Sectional count . 3
5.2 Conventional count (size number) . 4
5.3 Apparatus . 4
5.4 Procedure . 5
5.4.1 Cutting out the test pieces . 5
5.4.2 Weighing the test pieces . 6
5.5 Expression of results . 6
6 Metric yield . 6
6.1 Procedure . 6
6.2 Expression of results . 7
7 Properties of rubber threads . 7
8 Density . 7
8.1 Principle . 7
8.2 Method . 8
8.2.1 Method A . 8
8.2.2 Method B . 8
9 Tensile strength, modulus and elongation at break . 8
9.1 Apparatus . 8
9.2 Procedure . 9
9.2.1 Test piece preparation . 9
9.2.2 Loop formation and testing . 9
9.3 Expression of results .10
10 Schwartz value (SV) .10
10.1 Apparatus .10
10.2 Procedure .10
10.3 Expression of results .11
11 Elongation under a specified load .11
11.1 Test pieces .11
11.2 Apparatus .11
11.3 Procedure .12
11.4 Expression of results .12
12 Stress retention .13
12.1 Test pieces .13
12.2 Apparatus .13
12.3 Procedure .13
12.4 Expression of results .14
12.5 Test report .14
13 Tension set .14
13.1 Test piece preparation .14
13.2 Apparatus .15
13.3 Procedure .15
13.4 Expression of results .15
14 Accelerated ageing test on rubber threads in a relaxed state .16
14.1 General .16
14.2 Principle .16
14.3 Test pieces .16
14.4 Apparatus .16
14.5 Procedure .16
14.6 Expression of results .16
15 Dry-heat resistance .17
15.1 General .17
15.2 Principle .17
15.3 Apparatus .17
15.4 Procedure .18
15.5 Expression of results .18
15.6 Test report .18
16 Ribbons: Degree of adhesion between threads .19
16.1 General .19
16.2 Principle .19
16.3 Apparatus .19
16.4 Test pieces .19
16.5 Procedure .
...
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