... fire-prevention agent for fabric, timber and paper, as well as a fire-prevention coating, and dry powder for fire extinguisher ... (N+P2O5 ) is at 73%, and may be used as a basic raw material for N, P and K compound ... Phosphorus pentoxide% ≥61.0 61.0 3 Nitrogen, as N % ≥11.8 11.8 4 PH of 1% water solution 4.4 ... 2 0.2 6 Heavy metals, as Pb % ≤0.001 7 Arsenic, as As % ≤0.0003 8 Fluoride as F % ≤0.0029 Water ...