1 Scope
This standard specifies procedures intended for use in estimating the resistance of vulcanized or thermoplastic rubbers to cracking when exposed, under 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.
This standard is applicable to vulcanized or thermoplastic rubber.
Note 1: The relative ozone resistance of different rubbers depends on the conditions they are under, especially the concentration and temperature of the ozone, so, special attentions shall be paid in trying to extend the results of standard tests to usage. Moreover, the results of tensile strain test using thin specimen will be different from the aging conditions of the products in actual application due to difference in dimension, shape and deformation.
Note 2: See ISO 1431-3 for the method to determine the ozone concentration.
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 normative document (including any amendments) applies.
GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces for physical test methods (GB/T 2941-2006, ISO 23539:2004, IDT)
GB/T 11206 Standard test method for rubber deterioration - Surface cracking
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
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
dynamic strain
strain (normally a tensile strain) varying sinusoidally with time at some selected repetition rate or frequency
4 Principle
Test pieces of vulcanized or thermoplastic rubber are exposed, under continuous dynamic tensile strain, or under alternate periods of dynamic and static tensile strain, in a closed chamber at a constant temperature, to an atmosphere containing a fixed concentration of ozone. The test pieces are examined periodically for cracking.
Two alternative evaluation procedures of ozone cracking are described for selected values of ozone concentration and exposure temperature in the test:
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test pieces
7 Conditioning
8 Test conditions
9 Test procedures
10 Test results
11 Test report
Standard
GB/T 13642-2015 Rubber,vulcanized or thermoplastic―Resistance to ozone cracking―Dynamic strain testing (English Version)
Standard No.
GB/T 13642-2015
Status
valid
Language
English
File Format
PDF
Word Count
5500 words
Price(USD)
130.0
Implemented on
2015-10-1
Delivery
via email in 1 business day
Detail of GB/T 13642-2015
Standard No.
GB/T 13642-2015
English Name
Rubber,vulcanized or thermoplastic―Resistance to ozone cracking―Dynamic strain testing
1 Scope
This standard specifies procedures intended for use in estimating the resistance of vulcanized or thermoplastic rubbers to cracking when exposed, under 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.
This standard is applicable to vulcanized or thermoplastic rubber.
Note 1: The relative ozone resistance of different rubbers depends on the conditions they are under, especially the concentration and temperature of the ozone, so, special attentions shall be paid in trying to extend the results of standard tests to usage. Moreover, the results of tensile strain test using thin specimen will be different from the aging conditions of the products in actual application due to difference in dimension, shape and deformation.
Note 2: See ISO 1431-3 for the method to determine the ozone concentration.
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 normative document (including any amendments) applies.
GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces for physical test methods (GB/T 2941-2006, ISO 23539:2004, IDT)
GB/T 11206 Standard test method for rubber deterioration - Surface cracking
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
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
dynamic strain
strain (normally a tensile strain) varying sinusoidally with time at some selected repetition rate or frequency
4 Principle
Test pieces of vulcanized or thermoplastic rubber are exposed, under continuous dynamic tensile strain, or under alternate periods of dynamic and static tensile strain, in a closed chamber at a constant temperature, to an atmosphere containing a fixed concentration of ozone. The test pieces are examined periodically for cracking.
Two alternative evaluation procedures of ozone cracking are described for selected values of ozone concentration and exposure temperature in the test:
Contents of GB/T 13642-2015
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test pieces
7 Conditioning
8 Test conditions
9 Test procedures
10 Test results
11 Test report
