1. Appearance: Good urea is a white translucent granule, the surface is non-reflective, and the surface of the poor quality urea granule has obvious color and reflection.
2, feel: good urea smooth, loose, no wet feeling, poor quality of urea is not smooth and a sense of wetness.
3, fire: separately ignite two kinds of urea, good urea melting, white smoke, ammonia odor, poor urea melting is not complete and no ammonia.