Ordinary conveyor belt: covering layer: tensile strength not less than 15Mpa, elongation at break not less than 350%, wear amount ≤ 200mm3; The average value of interlayer adhesion strength in longitudinal specimens shall not be less than 3.2N/mm between layers; The distance between the covering adhesive and the fabric layer shall not be less than 2.1N/mm; The longitudinal elongation at break of the full thickness shall not be less than 10%; The elongation of the full thickness longitudinal reference force shall not exceed 1.5%.

Nylon (NN) and polyester (EP) conveyor belt cover layer, with a tensile strength of not less than 15Mpa, a tensile strength at break of not less than 350%, an average interlayer adhesive strength of not less than 4.5N/mm between fabric layers, and not less than 3.2N/mm between cover adhesive and fabric layers. The longitudinal tensile elongation at break of the entire thickness is not less than 10%, and the longitudinal reference force elongation at the entire thickness is not more than 4%. The cover adhesive is made of rubber and plastic blend, with a national standard tensile strength coefficient for the skeleton, and can be overlapped into a ring shape.