ISO 2321:2017
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.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Conditioning of samples or test pieces
5 Count
5.1 Sectional count
5.2 Conventional count (size number)
5.3 Apparatus
5.4 Procedure
5.4.1 Cutting out the test pieces
5.4.2 Weighing the test pieces
5.5 Expression of results
6 Metric yield
6.1 Procedure
6.2 Expression of results
7 Properties of rubber threads
8 Density
8.1 Principle
8.2 Method
8.2.1 Method A
8.2.2 Method B
9 Tensile strength, modulus and elongation at break
9.1 Apparatus
9.2 Procedure
9.2.1 Test piece preparation
9.2.2 Loop formation and testing
9.3 Expression of results
10 Schwartz value (SV)
10.1 Apparatus
10.2 Procedure
10.3 Expression of results
11 Elongation under a specified load
11.1 Test pieces
11.2 Apparatus
11.3 Procedure
11.4 Expression of results
12 Stress retention
12.1 Test pieces
12.2 Apparatus
12.3 Procedure
12.4 Expression of results
12.5 Test report
13 Tension set
13.1 Test piece preparation
13.2 Apparatus
13.3 Procedure
13.4 Expression of results
14 Accelerated ageing test on rubber threads in a relaxed state
14.1 General
14.2 Principle
14.3 Test pieces
14.4 Apparatus
14.5 Procedure
14.6 Expression of results
15 Dry-heat resistance
15.1 General
15.2 Principle
15.3 Apparatus
15.4 Procedure
15.5 Expression of results
15.6 Test report
16 Ribbons: Degree of adhesion between threads
16.1 General
16.2 Principle
16.3 Apparatus
16.4 Test pieces
16.5 Procedure
16.6 Expression of results
16.7 Test report
17 Resistance to copper staining during laundering
17.1 General
17.2 Principle
17.3 Reagents
17.4 Apparatus and materials
17.5 Test pieces
17.6 Preparation of test pieces
17.6.1 General
17.6.2 Individual samples of textile fabric
17.6.3 Individual textile yarns
17.6.4 Multifibre fabric swatches
17.7 Procedure
17.8 Test report
18 Effect of washing
18.1 General
18.2 Principle
18.3 Apparatus
18.4 Standard washing solution
18.5 Procedure
18.6 Expression of results
18.7 Test report
19 Resistance to atmospheric fume staining
19.1 General
19.2 Principle
19.2.1 General
19.2.2 Method A
19.2.3 Method B
19.3 Reagents
19.4 Apparatus and materials
19.4.1 Method A
19.4.2 Method B
19.5 Test pieces
19.5.1 General
19.5.2 Method A
19.5.3 Method B
19.6 Procedure
19.6.1 Method A
19.6.2 Method B
19.7 Test report
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Conditioning of samples or test pieces
5 Count
5.1 Sectional count
5.2 Conventional count (size number)
5.3 Apparatus
5.4 Procedure
5.4.1 Cutting out the test pieces
5.4.2 Weighing the test pieces
5.5 Expression of results
6 Metric yield
6.1 Procedure
6.2 Expression of results
7 Properties of rubber threads
8 Density
8.1 Principle
8.2 Method
8.2.1 Method A
8.2.2 Method B
9 Tensile strength, modulus and elongation at break
9.1 Apparatus
9.2 Procedure
9.2.1 Test piece preparation
9.2.2 Loop formation and testing
9.3 Expression of results
10 Schwartz value (SV)
10.1 Apparatus
10.2 Procedure
10.3 Expression of results
11 Elongation under a specified load
11.1 Test pieces
11.2 Apparatus
11.3 Procedure
11.4 Expression of results
12 Stress retention
12.1 Test pieces
12.2 Apparatus
12.3 Procedure
12.4 Expression of results
12.5 Test report
13 Tension set
13.1 Test piece preparation
13.2 Apparatus
13.3 Procedure
13.4 Expression of results
14 Accelerated ageing test on rubber threads in a relaxed state
14.1 General
14.2 Principle
14.3 Test pieces
14.4 Apparatus
14.5 Procedure
14.6 Expression of results
15 Dry-heat resistance
15.1 General
15.2 Principle
15.3 Apparatus
15.4 Procedure
15.5 Expression of results
15.6 Test report
16 Ribbons: Degree of adhesion between threads
16.1 General
16.2 Principle
16.3 Apparatus
16.4 Test pieces
16.5 Procedure
16.6 Expression of results
16.7 Test report
17 Resistance to copper staining during laundering
17.1 General
17.2 Principle
17.3 Reagents
17.4 Apparatus and materials
17.5 Test pieces
17.6 Preparation of test pieces
17.6.1 General
17.6.2 Individual samples of textile fabric
17.6.3 Individual textile yarns
17.6.4 Multifibre fabric swatches
17.7 Procedure
17.8 Test report
18 Effect of washing
18.1 General
18.2 Principle
18.3 Apparatus
18.4 Standard washing solution
18.5 Procedure
18.6 Expression of results
18.7 Test report
19 Resistance to atmospheric fume staining
19.1 General
19.2 Principle
19.2.1 General
19.2.2 Method A
19.2.3 Method B
19.3 Reagents
19.4 Apparatus and materials
19.4.1 Method A
19.4.2 Method B
19.5 Test pieces
19.5.1 General
19.5.2 Method A
19.5.3 Method B
19.6 Procedure
19.6.1 Method A
19.6.2 Method B
19.7 Test report
Bibliography