Tangshan Hengxinda Trading Co.,Ltd. was established in 2001. At present the main business of the company is divided into two parts: metallurgy auxiliary materials and chemical products. About metallurgy auxiliary materials mainly includes mould continuous casting protective slag, covering flux, drainage agent, refining synthesis slag, three-de-series(deoxidizing agent, desulfurizing agent, dephosphorization agent) and recarburizer; The main chemical products are soda ash(also called sodium carbonate), sodium sulphate anhydrous, caustic soda( also called sodium hydroxide), calcium chloride,...