1.One of the largest manufacturer in China 2.High quality and low price 3.Brand: BS Chemical 4.ISO 9001:2008 5.Best Service Definition: Wash oil is an important process of coal tar distillation fractions, one of about 6.5-10% coal tar is a complex mixture, rich in quinoline, isoquinoline, indole, α-Anaphthalene, β-methyltea, biphenyl, dimethyl tea, acenaphthene, fluorene and fluorene oxygen and ...