Use of solvent oil is widely used. The largest amount of devaluation paint solvent oil (commonly known as paint solvent oil), followed by a cooking oil, printing ink, leather, pesticides, insecticides, rubber, cosmetics, perfumes, pharmaceuticals, electronic parts and other solvent oil. There are about 400-500 solvents on the market, where solvent oil (hydrocarbon solvents, benzene compounds) accounted for about half.