Nitrogen content on dry basis, min. 46.3% Biuret, max. 0.6% Free ammonia, max. 0.02% Moisture content, max.: Drying method 0.3% Fischer assay 0.6% Granulometric composition: Under 1 mm, max. 3% 1-4 mm, min. 94% 2-4 mm, min. 70% Bulk density 0.70-0.78 g/cm3