Bitumen 10/20 is a kind of organic cementitious material with waterproof, moisture-proof and anti-corrosion properties. Bulk bitumen 50/70 can be divided into coal tar asphalt, petroleum asphalt and natural asphalt. Among them, coal tar asphalt is a by-product of coking. Petroleum asphalt is the residue of crude oil distillation. Natural asphalt is stored underground, and some form ore beds or accumulate on the surface of the earth's crust. Bitumen for sale is mainly used in coating, plastic, rubber and other industries and pavement.