Hongye Chemical Co., Ltd is the leading professional manufacturer and supplier of Thiourea Dioxide and pulp bleaching agent FAS. We can produce 50000MT Thiourea Dioxide(Formamidine sulfinic acid) &pulp bleaching agent FAS. TDO is a new kind of reducing agent that used as exchange of sodium hydrosulfite. It is widely used in textile and paper making industry. This product is also used in leather processing industry, paper, pulp and board industry, photographic industry, bleaching and reducing agents. This product is also a component of decolorisation agents. In macromolecule material industry, it is used as catalysis agent and stabilizer of resinic producing, and it is also used in organic synthesization of sensitizing material, and medicine, medical, spicery materials in fine chemicals, and also can be applied in the recycling and separating of heavy metals. Physical & Chemical Features White Crystalline Powder,odorless CAS NO. 1758-73-2 or 4189-44-0 UN NO:3341 Dangerous Goods Class:4.2 Specification: Byname: Formamidine Sulfinic Acid Molecular Formula:(NH2)2CSO2 PH 4 (1% Solution) Purity: 99.%Min Thiourea: 0.10%Max Moisture:0.05%Max Iron(Fe):10ppm Max Sulphate: 0.17%Max