No. | Item | Unit | HJF | |||
Requirements | Measured value | |||||
1 | Tensile strength | MPa | ≥10 | 12.5 | ||
Elongation at break | % | ≥300 | 360 | |||
2 | Air oven aging test 70±2℃×10 d | |||||
Tensile strength change rate | % | ±20 | 8 | |||
Elongation at break | % | ≥250 | 320 | |||
Change rate of elongation at break | % | ±20 | -9 | |||
3 | Oil resistance test (ASTM 2# oil) 100±2℃×24 h | |||||
Tensile strength change rate | % | ±40 | -5 | |||
Change rate of elongation at break | % | ±40 | -10 | |||
4 | Thermal extension test 200±2℃×15 min×0.2MPa | |||||
Elongation under load | % | ≤175 | 35 | |||
Permanent deformation after cooling | % | ≤25 | 6 | |||
5 | Brittle temperature | ℃ | ≤-36 | -40 | ||
Llow-temperature bend test -35±2℃×16 h | No cracks | No cracks | ||||
6 | Deflection test | Ten thousand times | - | 30 o cracks | ||