Barytes Powder suppliers Our History Zhengzhou Top Trading Co., Ltd. was founded in the year 2012, which is a branch company of Xinmi Wanli Industry Development Co., Ltd. (Wanli Industry), a leading supplier of ceramic proppant. Top Supplychain is specialized in supply-chain of various kinds of chemicals. In 1994, Xinmi Wanli Industry Development Co., Ltd. was founded. Originally Wanli Industry...