Test itemTest methodRequired value
Outer rubberInner rubber
1. Before aging
1.1 Tensile strengthISO 37:201118 MPa or more10 MPa or more
1.2 ElongationISO 37:2011400 % or more400 % or more
1.3 HardnessISO 7619-1:201060 ± 10 (Durometer hardnessType A)50 ± 10 (Durometer Hardness Type A)
2. After agingISO 188:2011Air oven aging, 70°C ± 1°C, 96 hAir oven aging, 70°C ± 1°C, 96 h
2.1 Tensile strengthISO 37:2011Not less than 80 % of the original propertyNot less than 80 % of the origi- nal property
2.2 ElongationISO 37:2011Not less than 80 % of the original propertyNot less than 80 % of the origi- nal property
2.3 HardnessISO 7619-1:2010Not to exceed the original prop- erty by more than 8Not to exceed the original prop- erty by more than 8
3. TearISO 34-1:2010400 N/cm or moreNo requirement
4. Compression setISO 815-1:200830 %(70 ± 1 °C, 22hours) or lessNo requirement
5. Static ozone aging testISO 1431-1:2012No cracks after elongation by 20 % and exposure to 50 pphma at 40 °C for 96 hNo requirement

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