Physical and mechanical property of cover layer: Property level of cover layertensile strengthtensile yieldabrasion value Mpa%mm3 H24.0450120 D18.0400100 L15.0350200 Tensile property of through thickness: A. The longitudinal tensile strength is not lower than the following nominal value: 315 400 500 600 630 8oo 9oo 1000n/mm B. The total thickness elongation rate of the belt should not less than 10%, the reference force elongation rate of total thickness should no more than 4%. C. Straightness: no more than 25mm. D. Plunger bond strength: Index description strength between layers cover layer and fabric layer Thickness of cover layer1.5mmthickness of cover layer >1.5mm Sample average value4.5n/mm3.2n/mm3.5n/mm