Copper(II) phosphate are inorganic compounds with the formula Cu3(PO4)2. They can be regarded as the cupric salts of phosphoric acid. Anhydrous copper(II) phosphate and a trihydrate are blue solids.

Alumina trihydrate is a white, odorless, powdery, solid substances which is mostly used for the production of aluminum metal. It is widely used flame retardant due to its versatility and low cost.