chemical formula NH4OH, ammonium hydroxide is a corrosive chemical with a strong ammonia odor. Ammonium hydroxide fumes are irritating to lungs, skin and eyes. Ammonium hydroxide is used in SC1 cleaning solutions and is commonly sold as a 30% solution with a density of 0.90Kg/L.
Ammonium hydroxide, although it doesn't exist as an isolatable chemical compound, is a name sometimes given to an aqueous solution of ammonia. Aqueous solutions of ammonia are also commonly referred to as aqua ammonia.