Moisture, per cent by weight, maximum   : 5.0

Free Phosphoric acid (as P2O5)% by weight, max.  : 4.0

Water soluble phosphate (as P2O5)% by weight , min : 16.0

Particle Size- Not less than 90% of the material shall pass thru 4 mm IS sieve and shall be retained on 1 mm IS sieve. Not more than 5% shall pass thru 1 mm IS sieve.