Diammonium phosphate is used as a high effective non-chloride N, P compound fertilizer in agriculture, as well as other industry fields.The standard as below: Main content:99pct min Phosphorus pentoxide:53pct min Nitrogen:21pct min Water:0.5pct max Arsenic as As:1ppm max Heaby metal as Pb:10ppm max Water insoluble:0.1pct max Fluoride as F:10ppm max Ph value:4.4-4.6 Please be free to contact with us ,my dear friend.