Standard No.:	GB/T 7762-2003
English Name:	Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test
Chinese Name:	硫化橡胶或热塑性橡胶 耐臭氧龟裂静态拉伸试验
Chinese Classification:	G40    Rubber products in general
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	2003-1-10
Implemented on:	2003-7-1
Status:	superseded
Superseded by:	GB/T 7762-2014 Rubber,vulcanized or thermoplastic—Resistance to ozone cracking—Static strain testing
Superseded on:	2015-6-1
Superseding:	GB/T 7762-1987 Rubber vulcanized--To zone ageing--Static strain test method
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

This standard specifies a method for the determination of resistance of vulcanized or thermoplastic rubbers to cracking when exposed, under static tensile strain, to air containing a definite concentration of ozone and at a definite temperature in circumstances that exclude the effects of direct light. The relative ozone resistance of different rubbers can vary markedly according to 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 may be quite different owing to the effects of size and the type and magnitude of deformation. Explanatory notes on the nature of ozone cracking are given in Appendix A.

Foreword I 1 Scope 2 Normative References 3 Definitions 4 Principle 5 Apparatus 6 Test Piece 7 Conditioning 8 Test Conditions 9 Test Procedure 10 Result Expression 11 Test Report Appendix A (Informative) Explanatory Notes Appendix B (Informative) Determination Method for Ozone Concentration - Iodometry