we have internationly exepted standard ureaN46% and the specification.
nitrogen contens: 46%min (calculation whit dry substance)
moisture: 0.5%max by method of drying
biuret: 1.0% max
garnulation: 1mm to 4mm not less than 90%
color: pure white
melting point: 132C
physsical: granular, free flowing, treated agenst cacking 100%, free from harmful substences