Ammonium hexafluoroaluminate

Ammonium hexafluoroaluminate is an inorganic compound with the chemical formula of (NH4)3[AlF6]. It is a white solid. Upon heating, it converts to aluminium trifluoride, a reaction that releases hydrogen fluoride. It has also been used as a precursor to zeolites.

Preparation
Ammonium hexafluoroaluminate can be obtained by the reaction of ammonium fluoride and aluminium hydroxide.
 * $$\mathrm{6 \ NH_4F + Al(OH)_3 \longrightarrow (NH_4)_3[AlF_6] + 3 \ NH_4OH}$$