... tech.grade and food grade , Assay:99.0 %min , P2O5: 53.0 %min , N:20.8 %min , PH : 7.8-8.2 Diammonium phosphate (DAP) Chemical formula: ( ... content, % min99.099.0Phosphorus pent-oxide, % min53.053.0Nitrogen as N, % min20.820.8Water insoluble, % max0.10.05Moisture, % max0 ... ,as Pb. % max------0.001Arsenic,as As. % max------0.0003Fluorde,as F. % max------0.002PH7.8-8.27.8-8.2USE:Used as fire-extinguishing ...