Aluminium fluoride (AlF3) is an inorganic compound used primarily in the production of aluminium. This colorless solid can be prepared synthetically but also occurs in nature.

It is used in the production of aluminium metal. Aluminium fluoride is an important additive for the production of aluminium by electrolysis. Together with cryolite, it lowers the melting point to below 1000 °C and increases the conductivity of the solution. It is into this molten salt that aluminium oxide is dissolved and then electrolyzed to give bulk Al metal.

When used with zirconium fluoride, aluminium fluoride is an ingredient for the production of fluoroaluminate glasses. It is also used to inhibit fermentation. It is a sputtering target for preparation of low index films.

Greenstar’s AlF3 process involves reaction of Aluminium Hydroxide with Hydro Fluosilicic acid. This is later filtered to remove Silica. The high purity aluminium fluoride is then crystallized and dried.