1

Before ageing test

1.1 Tensile strength(MPa)

≥6.5

1.2 Elongation at break(%)

≥200

2

Air oven ageing test

2.1 Test condition

135±2℃/168h

2.2 Tensile strength(MPa)

≥5.0

2.3 Tensile strength rate(%)

±30

2.4 Elongation at break rate (%)

±30

3

Air bomb ageing test

3.1 Test condition

127±2℃/40h, stress 0.55<span  ±0.02MPa

3.2 Tensile strength rate(%)

±30

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(%)

< 175

4.3 Un-loading elongation rate(%)

< 25

5

Ozone ageing test

5.1 Test condition

25±2℃/30h, concentration 0.025-0.03%

5.2 Test result

No cracks

6

Maximum material operating temperature

90℃