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International
Standard
ISO 1431-1
Seventh edition
Rubber, vulcanized or
2024-07
thermoplastic — Resistance to
ozone cracking —
Part 1:
Static and dynamic strain testing
Caoutchouc vulcanisé ou thermoplastique — Résistance au
craquelage par l'ozone —
Partie 1: Essais sous allongement statique et dynamique
Reference number
© ISO 2024
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ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Calibration . 7
7 Test pieces . 7
7.1 General .7
7.2 Wide strip test piece .7
7.3 Narrow strip test piece .7
7.4 Dumb-bell test piece .8
8 Conditioning . 8
8.1 Conditioning in the unstrained state.8
8.2 Conditioning in the strained state (for static strain testing only) .8
9 Test conditions . 9
9.1 Ozone concentration . .9
9.2 Temperature .9
9.3 Relative humidity .9
9.4 Maximum elongation .10
9.5 Exposure period .10
10 Static strain testing .10
10.1 General .10
10.2 Procedure A .10
10.3 Procedure B .10
10.4 Procedure C .10
11 Dynamic strain testing .11
11.1 General .11
11.2 Continuous dynamic exposure .11
11.2.1 Choice of procedure .11
11.2.2 Procedure A .11
11.2.3 Procedure B .11
11.3 Intermittent dynamic exposure .11
11.3.1 Exposure procedure .11
11.3.2 Procedure A . 12
11.3.3 Procedure B . 12
12 Expression of results .12
12.1 Procedure A . 12
12.1.1 Procedure A.1: evaluation with visual assessment . 12
12.1.2 Procedure A.2: evaluation with image analysing technique . 12
12.2 Procedure B . 12
12.3 Procedure C . 12
12.3.1 Procedure C.1: evaluation with visual assessment . 12
12.3.2 Procedure C.2: evaluation with image analysing technique . 13
12.4 Procedure D: evaluation with physical properties change .14
13 Test report . 14
Annex A (informative) Ozone cracking — Explanatory notes .16
iii
Annex B (normative) Calibration schedule . 17
Annex C (informative) Ozone cracking — Rating scales . 19
Annex D (informative) Sealing the edges of a test piece .20
Bibliography .23
iv
Foreword
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
This seventh edition cancels and replaces the sixth edition (ISO 1431-1:2022), which has been technically
revised.
The main changes are as follows:
— sealing edges of a test piece has been added in 7.1;
— Annex D has been added.
A list of all parts in the ISO 1431 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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