EPDM insulation compound

    This products implements performance requirements for EPDM insulated rubber of national standard GB/T 7594-87 and is suitable for insulating layers of common rubber sheathed cable, mining cable, UCPJB, UCPJR, wind power cable, and etc. Its mechanical, physical and electrical properties are as follows:
    Indicator requirements and measured performance

    Test item Unit HJ-1 HJ-2 HJ-3
    Standard requirements Typical values Standard requirements Standard requirements Typical values Standard requirements
    Initial tensile strength Mpa ≥5.0 6.5 ≥5.0 7.5 ≥4.2 8.0
    Elongation at break % ≥250 280 ≥250 290 ≥200 240
    Thermal aging of air box Conditions 75±2℃×240h 80±2℃×240h 135±2℃×168h
    Tensile strength change rate % ±30 +8 ±30 +9.0 ±30 +10.0
    Change rate of elongation at break % ±30 -8 ±30 -10.0 ±30 -15.7
    Thermal extension test Conditions 200±2℃× 15 min×0.2MPa 250±3℃× 15 min×0.2MPa min×0.2MPa min×0.2MPa
    Elongation under load % ≤175 75 ≤175 68 ≤175 68
    Permanent deformation after cooling % ≤25 18 ≤20 15 ≤15 11
    Volume resistivity at 20℃ Ω﹒m ≥1.0×1013 5.5×1013 ≥1.0×1014 7.2×1014 ≥1.0×1015 6.7×1015
    Dielectric strength MV/m ? 26 ? 28 ? 28
    Ozone resistance Conditions 250±2℃× 24h ×0.025~0.03%
    Results ? ? ? ? No cracks No cracks



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