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Test item | Test method | Required value | |
Outer rubber | Inner rubber | ||
1. Before aging | – | – | – |
1.1 Tensile strength | 18 MPa or more | 10 MPa or more | |
1.2 Elongation | 400 % or more | 400 % or more | |
1.3 Hardness | 60 ± 10 (Durometer hardness Type A) | 50 ± 10 (Durometer Hardness Type A) | |
2. After aging | Air oven aging, 70°C ± 1°C, 96 h | Air oven aging, 70°C ± 1°C, 96 h | |
2.1 Tensile strength | Not less than 80 % of the original property | Not less than 80 % of the origi- nal property | |
2.2 Elongation | Not less than 80 % of the original property | Not less than 80 % of the origi- nal property | |
2.3 Hardness | Not to exceed the original prop- erty by more than 8 | Not to exceed the original prop- erty by more than 8 | |
3. Tear | 400 N/cm or more | No requirement | |
4. Compression set | 30 %(70 ± 1 °C, 22hours) or less | No requirement | |
5. Static ozone aging test | No cracks after elongation by 20 % and exposure to 50 pphma at 40 °C for 96 h | No requirement | |