Total nitrogen content by weight (on dry basis): minimum 46% Biuret content by weight: maximum 1.5% Particle size: Not less than 90% of the material shall pass through 4 mm IS sieve and be retained on 2 mm IS sieve. Not more than 5% shall be below 1 mm IS sieve Packing: Packed in 50 kg (dry) capacity woven polypropylene bags with polyethylene inner lining. 4% empty bags to be supplied at no extra cost Each bag to guarantee minimum product weight (net) as specified on the bag