Ammonium Polyphosphate (APP) CAS NO.: 68333-79-9 Index /Grade Ammonium Polyphosphate Super Grade Appearance White Powder Phosphorus content ( P2O5 )% 70 Nitrogen content (N)% 13 Bulk density 0.7 PH Value 4.5-6.5 Degree of Polymerization 1000 min Mean Particle Diameter µm ¡Ü 10.0 Viscosity (25DEG)Mpa.s ¡Ü100