cas;no:7722-76-1 properties: white granular crystal; relative density at 1.803, melting point at 190 , easily soluble in water, slightly soluble in alcohol, insoluble in ketone, ph value of 1% solution is 4.5. uses: as a fire-prevention agent for fabric, timber and paper, as well as a fire-prevention coating, and dry powder for fire extinguisher. for food grade it is mainly used as a fermentation agent, nourishment, and so on. used as a high effective non-chloride n, p compound fertilizer in agriculture. its total nourishment (n+p2o5 ) is at 73%, and may be used as a basic raw material for n, p and k compound fertilizer.