Hongjian Polymer
Mining cable sheathing compound
This series of product is produced according to requirements of national standard GB7594.7-87 and complies with the provisions of the coal industry standard MT818-2009.
Indicator requirements and measured performance
| No. | Test item | Unit | Requirements | Results | |
| Before aging | Tensile strength | Mpa | ≥11.0 | 12.9 | |
| Elongation at break | ％ | ≥250 | 460 | ||
| Air oven aging test | Ageing condition | Temperature | ºC | 75±2 | 75±2 |
| Time | h | 10×24 | 10×24 | ||
| Tensile strength after aging | / | Mpa | / | 13.1 | |
| Change rate | ％ | ≤-15 | 2 | ||
| Elongation at break after aging | / | ％ | ≥200 | 421 | |
| Change rate | ％ | ≤-25 | -8 | ||
| Thermal extension test | Test conditions | Air temperature | ºC | 200±3 | 200±3 |
| Load time | min | 15 | 15 | ||
| Mechanical stress | N/cm2 | 20 | 20 | ||
| Elongation under load | ％ | ≤175 | 38 | ||
| Permanent deformation after cooling | ％ | ≤25 | 7 | ||
| Oil immersion test | Test conditions | Oil temperature | ºC | 100±2 | 100±2 |
| Oil immersion time | h | 24 | 24 | ||
| Tensile strength change rate | ％ | ≤-40 | -8 | ||
| Change rate of elongation at break | ％ | ≤-40 | -3 | ||
| Tear test | Tearing strength | N/mm | ≥5.0 | 8.5 | |
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