Nitrogen 46.0% minimum Moisture (1) 0.5% maximum (fisher method) Moisture (2) 0.3% maximum method of drying friability 100 Biuret 1.0% maximum by weight Free ammonia 160 pxt ppm maximum Melting point 132 degrees centigrade Color pure white Granulation 1-4 mm 90.0% minimum Anti-caking agent 0.5% maximum Agricultural (Urea,46%).grub 2008 . minimum 12,500 metric tons