The quality of the thiourea dioxide as follows:*thiourea dioxide:99% min*risidual dioxide:0.1% max *moisture:0.05% max*sulphate:0.17% max*molysite:10PPM max Using:*reducing agent that used as exchange of sodium hydrosulfite, it is widely used in textile and paper making industry, also used in leather processing industry ,paper, pulp and board industry, photographic industry, bleaching and reducing agents. *a component of decolorisation agents, in macromolecular 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 medicial, spicery materials in fine chemicals, and also can be applied in the recycling and separating of heavy metals.