White granular 2-4mm, no smell. It is easily soluble in water, but insokuble in alcohol and acetone.Easy absorption of moisure agglomerate, with strong corrosive and permeability. Has hygroscopic,moisure absorption into pieces after consolidation. It can completely broken down into ammoniaand sulphuric acid when heated to 513?above. And it release ammonia when it react with alkali. Low poison,stimulating.