Diammonium Phosphate(DPA) Industrial Grade and Food Grade 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. Used as a high effective non-chloride N, P ... . It contains totally 74% fertilizer elements (N+P2O5), used as a basic raw material for N, P and K compound fertilizer ...