serial number item indicator common environmental protection 1 thickness mm 0.2 to 4 2 width m 2.5 to 8 3 tensile strength (vertically and horizontally) MPa≥17 ≥25 4 breaking elongation rate (vertically and horizontally) % ≥450 ≥550 5 angle tear strength N/mm ≥80 ≥110 6 carbon black content % 2.0 to 3.0 2.0 to 3.0 7 resistance to environment stress cracking F20 ≥1500 8 low-temperature impact in -70℃ approved 9 oxidative inductive time in 200℃ ≥20
