Sulfamic acid, is an inorganic solid acid formed by the hydroxyl group of sulfuric acid is replaced by amino groups, the chemical formula is NH2SO3H, the molecular weight is 97.09, generally white, odorless oblique square sheet crystals, relative density 2.126, melting point 205 °C, soluble in water, liquid ammonia, at room temperature, as long as it is kept dry and does not contact with water, solid sulfamic acid does not absorb hygroscopicity, relatively stable.