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Name : Selenium DioxideChemical Composition : SeO2 Red-white or shiny needle crystal powder, irritating smellMolecular weight: 110.96 Vapor pressure 0.13kPa (157 c) Melting point: 340 ~ 350 c Solubility: Insoluble in water, ethanol, acetone, benzene, acetic acid Density: Relative density (water = 1) 3.95 Stability: StableProperties: White, glittering squared crystal, specific weight is 59-3.95S , is extremely apt for evaporation; sublimation temperature is 315 S , the melting point is 340-350. It would easily turns into selenious acid when soluble in water(H2SeO3). The gasous selenium dioxide is yellowrish green, with stink of garlic, and toxic. The selenium dioxide is a strong oxidizer, and can be reduced into elementary selenium by sulfur dioxide, hydrogen, ammonia, carbon monoxide and carbon.Applications:used as oxidizer, catalyst, and chemical reagent, as well as be used as addictives for electrolytic manganese enterprises .