Items

index

B

S

J

1. Hardness ( Shore A )

60±5

60±5

60±5

2.Tensile strength ,MPa                ≥

15

12

10

3.Elongation at break , %              ≥

380

380

300

4.Compression set %

70ºC×24h,%       ≤

35

35

35

23ºC×168h,%      ≤

20

20

20

5.Tear strength,KN/m                  ≥

30

25

25

6.Brittleness temperature,°C                                     ≤

-45

-40

-40

7.Air aging

70ºC×168h

Hardness ( Shore A )   ≤

8

8

--

Tensile strength,MPa          ≥

12

10

Elongation at break , %           ≥

300

300

100ºC×168h

Hardness ( Shore A )   ≤

--

--

8

Tensile strength, MPa          ≥

9

Elongation at break , %           ≥

250

8. Resistance ozone ageing 50pphm: 20%,  48h

2grade

2 grade

0 grade

9. Adhesion of rubber to metal

With contact section in elastomer