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.