Changsha Weichuang Chemical Co., Ltd. started business on 2000. We are a professional modern chemical manufacturer and exporter of Sodium Metabisulfite(SMBS), Sodium Thiosulphate(Sodium Thiosulfate), Sodium Sulphite, and Ferrous Carbonate. The head office is in Changsha City, and the plant located in Hengyang City, which is close to Changsha port and Huangpu port. Exporting is very convenient.