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Sulfamic acid is an inorganic solid acid formed when the hydroxyl group of sulfuric acid is replaced by an amino group, chemical formula NH2SO3H, molecular weight 97.09, generally white, odorless rhomboidal flaky crystals, relative density 2.126, melting point 205 ℃, soluble in water, liquid ammonia, at room temperature, as long as it is kept dry and does not come into contact with water, the solid sulfamic acid does not hygroscopic, and it is relatively stable. The aqueous solution of sulfamic acid has the same strong acidity as hydrochloric acid, sulfuric acid and so on, so the alias is also called solid sulfuric acid, which has the characteristics of non-volatile, odorless and low toxicity to human body. The dust or solution is irritating to the eyes and skin and can cause burns, with a maximum permissible concentration of 10mg/m3. Sulfamic acid can be used in the synthesis of herbicides, fire retardants, sweeteners, antiseptics, metal cleaners and so on, and is a common chemical raw material.
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