Colorless transparent sticky liquid at room temperature; strong hygroscopicity and ammonia smell. Has miscibility with water, methanol, ethanol and acetone, slightly soluble in benzene, ether and carbon tetrachloride. Alkaline aqueous solution, can absorb acidic gas, heating, and can be absorbed gas release. It has emulsification and bubble effect. It can generate salts with inorganic and organic acid; generate ester with acid anhydride. Burning danger with flame and high temperature; The steam is poisonous.