cas;no:7783-28-0 properties: white granular crystal, relative density at 1.619, melting point at 155 , easily soluble in water, insoluble in alcohol, ph value of 1% solution is 8.0 uses: as a fire-prevention agent for fabric, timber and paper. for food grade it is mainly used as a fermentation agent, nourishment, and so on. it contains totally 74% fertilizer elements, used as a basic raw material for n, p and k compound fertilizer.