JIS K6259 standard introduction
JIS K6259 is a test method for “Determination of ozone resistance of vulcanized rubber and thermoplastic rubber”. The following is part of the original English standard. For copyright protection, if you need the full text of JIS K6259 standard or the Chinese version of JIS K6259 standard, please contact customer service.

1 Scope
This Japanese Industrial Standard specifies the testing methods t o measure the resistance to ozone cracking for vulcanized rubber.

Remarks 1 The standards cited in this Standard are listed as follows:

JIS K 6200 Glossary of terms used in rubber industry

JIS K 6250 General rules of physical testing methods for rubber,vulcanized or thermoplastic

JIS K 6251 Tensile testing methods for vulcanized rubber

JIS K 8001 General rule for test methods of reagents

JIS K 8637 Sodium thiosulfate pentahydrate

JIS K 8913 Potassium iodide

JIS K 9007 Potassium dihydrogenphosphate

JIS K 9019 Disodium hydrogenphosphate 12-water

JIS K6259-2004 “Determination of ozone resistance of vulcanized rubber and thermoplastic rubber”

2 The International Standards corresponding to this Standard are listed as follows:

IS0 1431-1:1989 Rubber, vulcanized or thermoplastic – Resistance to ozone cracking – Part 1 :Static strain test

ISOIDIS 1431-2:1992 Rubber, vulcanized – Resistance to ozone cracking – Part 2 :Dynamic strain test

3 The units and numerical values given in ( 1 in this Standard are based on the traditional units, and are standard values. However,traditional units becomes an informative reference on and afterApril Ist, 1995.

JIS K6259-2004 “Determination of ozone resistance of vulcanized rubber and thermoplastic rubber”

2 Definitions
For the purposes of this Standard, the definitions given in JIS K 6200 and the following definitions apply.

(1)critical strain The maximum tensile strain, which has no cracking, given when test piece has been exposed in specified ozone-concentrated atmosphere at specified temperature for specified duration.

(2)limiting strain The maximum tensile strain given when the duration needed for cracking on a test piece is very long, and when the occurring time of its cracking cannot be forecasted.

(3)static ozone-crackingtest When a test piece, under a static tensile strain,is exposed in the air containing an artificially prepared low concentrated ozone,the test to evaluate the condition of cracking, the duration needed to make cracking, or the maximum tensile strain by which no cracking takes place.

(4)dynamic ozone-cracking test When a test piece is exposed in the air containing an artificially prepared low concentrated ozone while dynamic tensile strain is applying on the test piece, the test to evaluate the condition of cracking and the duration by which cracking takes place