ISO 1431-1 is a test method for “Ozone cracking resistance of plastics, vulcanized rubber or thermoplastic rubber”, the current standard is ISO 1431-1-2012,

ISO 1431 standard range
This part of ISO 1431 specifies procedures for evaluating resistance to cracking of vulcanized or thermoplastic rubbers when exposed to air containing a certain concentration of ozone under static or dynamic tensile conditions and at temperatures, excluding the effect of direct light.

The main concern is that due to the ozone resistance of different rubber products in different environments, there will be significant differences, such as the effect of ozone concentration and temperature. In addition, due to the inconsistency between the size of the product in actual use and the sample in the test, the deformation between the test results and the actual use may also be inconsistent. Therefore, it is standard for users to carefully evaluate the relevance of the test results to the actual use process.

ISO 1431-1-2004 “Ozone cracking resistance of plastics, vulcanized or thermoplastic rubber”

Appendix A. The properties of ozone lysis are described.

ISO 1431-3 describes reference and alternative methods for determining ozone concentrations.

English extract from ISO 1431
WARNING — Persons using this part of ISO 1431 should be familiar with normal laboratory practice.This part of ISO 1431 does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and toensure compliance with any national regulatory conditions.

1 Scope
This part of ISO 1431 specifies procedures intended for use in estimating the resistance of vulcanized or thermoplastic rubbers to cracking when exposed, under static or dynamic tensile strain, to air containing a definite concentration of ozone and at a definite temperature in circumstances that exclude the effects of direct light.

Great caution is necessary in attempting to relate standard test results to service performance since the relative ozone resistance of different rubbers can vary markedly depending on the conditions, especially ozone concentration and temperature. In addition, tests are carried out on thin test pieces deformed in tension and the significance of attack for articles in service can be quite different owing to the effects of size and of the type and magnitude of the deformation. Explanatory notes on the nature of ozone cracking are given in Annex A.

Reference and alternative methods for determining the ozone concentration are described in ISO 1431-3.

ISO 1431-1-2004 “Ozone cracking resistance of plastics, vulcanized or thermoplastic rubber”

2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties

ISO 1431-3, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 3: Reference and alternative methods for determining the ozone concentration in laboratory test chambers

ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods