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1

Before ageing test

1.1 Tensile strength(MPa)

≥7.0

1.2 Elongation at break(%)

≥200

1.3 Mooney Viscosity(ML100℃1+4)

65±5

2

Air oven ageing test

2.1 Test condition

120±2℃/72h

2.2 Tensile strength(MPa)

≥7.0

2.3 Elongation at break(%)

≥200

3

Air oven ageing test

3.1 Test condition

120±2℃/240h

3.2 Tensile strength rate(%)

±20

3.3 Elongation at break rate(%)

±30

4

Heat extension test

4.1 Test condition

250±3℃/15min, stress20N/cm²

4.2 Loading elongation rate(%)

< 100

4.3 Un-loading elongation rate(%)

< 25

5

Ozone ageing test

5.1 Test condition

25±2℃/24h, concentration 2.5-3%

5.2 Test result

No cracks

5.3 Test condition

40±2℃/72h, concentration 200±50ppm

5.4 Test result

No cracks

6

Low-temperature bend test

6.1 Test condition

-50±3℃

6.2 Low-temperature elongation at unbreak(%)

> 30

6.3 Wire surface after low-temperature bend

No cracks

7

Maximum material operating temperature

90℃

8

Carbon black content

≥2%