... , 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 ... As. % max------0.0003Fluorde,as F. % max------0.002PH7.8-8.27.8-8.2 USE:Used as fire-extinguishing agent for fabric, woods ...