ISO 1658:2022
Natural rubber (NR) — Evaluation procedure
This document specifies
— physical and chemical tests on raw natural rubbers;
— standard materials, standard test formulae, equipment and processing methods for evaluating the vulcanization characteristics of natural rubber (NR).
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling and further preparative procedures
5 Physical and chemical tests on raw rubber
5.1 Mooney viscosity
5.2 Volatile-matter content
5.3 Other specifications on requirements
6 Preparation of test mix
6.1 General
6.2 Standard test formulae
6.3 Procedure
6.3.1 Equipment and procedure
6.3.2 Mill mixing procedure for Formulae (1) and 2 (gum compounds)
6.3.3 Mill mixing procedure for Formulae (1) and 2 (gum compounds) using masterbatches
6.3.4 Mixing procedures for Formula (3) (black-filled compound)
7 Evaluation of vulcanization characteristics by a curemeter test
7.1 Using an oscillating-disc curemeter
7.2 Using a rotorless curemeter
8 Evaluation of tensile stress-strain properties of vulcanized test mixes
9 Precision statement
10 Test report
Annex A (normative) Procedure for preparing gum compounds through use of masterbatches
Annex B (informative) Precision statement for both mill and internal mixer
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling and further preparative procedures
5 Physical and chemical tests on raw rubber
5.1 Mooney viscosity
5.2 Volatile-matter content
5.3 Other specifications on requirements
6 Preparation of test mix
6.1 General
6.2 Standard test formulae
6.3 Procedure
6.3.1 Equipment and procedure
6.3.2 Mill mixing procedure for Formulae (1) and 2 (gum compounds)
6.3.3 Mill mixing procedure for Formulae (1) and 2 (gum compounds) using masterbatches
6.3.4 Mixing procedures for Formula (3) (black-filled compound)
7 Evaluation of vulcanization characteristics by a curemeter test
7.1 Using an oscillating-disc curemeter
7.2 Using a rotorless curemeter
8 Evaluation of tensile stress-strain properties of vulcanized test mixes
9 Precision statement
10 Test report
Annex A (normative) Procedure for preparing gum compounds through use of masterbatches
Annex B (informative) Precision statement for both mill and internal mixer
Bibliography