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Semi-conductive shielding compound

This product is produced according to index requirements for peroxide cross-linking semi-conductive shielding materials for EPR insulated cables of national standard JB/T 10738-2007: Semi-conductive shielding compound for power cables of rated voltages up to and including 35kV. It is suitable for maximum permissible continuous operating temperature of conductor of 90℃.

Indicator requirements and measured performance

No. Item Unit HBD HBD-1
Requirements Measured value Requirements Measured value
1 Density g/cm3 ≤1.20 1.10 ≤1.20 1.12
2 Tensile strength MPa ≥6.0 7.0 ≥6.0 7.0
Elongation at break % ≥180 240 ≥200 320
3 Air oven aging test 135±2℃×168 h
Tensile strength change rate   % ±30 8 ±30 10
Change rate of elongation at break  % ±30 -20 ±30 -25
4 Impact embrittlement -40 -45
Impact embrittlement performance      Failure rate ≤15/30 10/30 ≤15/30 9/30
5 Thermal elongation   200±2℃×15 min×0.2MPa
Elongation under load % ≤80 15 ≤80 15
Permanent deformation after cooling % ≤10 5 ≤10 5
6 Volume resistivity at 20℃ Ω·cm ≤100 80 ≤100 50
7 Volume resistivity at 90℃ Ω·cm ≤10000 5000 ≤5000 3000
8 Volume resistivity after air aging 100±2℃×168 h
Volume resistivity at 90℃ Ω·cm ≤1000 800 ≤500 400

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