... .hardness:60-70A 4.abrasion:300mm3 5.elongation:300% rubber transmission beltusage:widely used for metallurgy,mine,road,harbor,dock,electricity ... on the life of a conveyor belt and the smooth transmission lines running smoothly. Conveyor belt method of connector commonly used in ... , NN150, NN200, NN250, NN300, NN350, NN400, NN450, NN500, etc. rubber transmission belt