YunNan Chengjiang U-Best Industrial Co., Ltd was established in 2004, which affiliated to YunNan Chengjiang Dean Group Co., Ltd, specialized in the research , develop, manufacturing and distribution of chemical products , including rock phosphate ,phosphorus chemical industry , chemical raw material and other phosphorus products. Dean group is one of the five-hundred biggest industrial enterprises in China as well as the top enterprises in YunNan province, our products have been passed ISO9002 ...