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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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