Used primarily in the production of aluminum through the Hall-Héroult process, where it serves as a source of fluoride ions to lower the melting point of alumina in electrolytic cells. It helps improve the efficiency and stability of the smelting process. Also utilized in the manufacture of fluorinated compounds and in some ceramic and glass applications where controlled fluoride release is required. Its hydrate form is valued for safer handling and easier dosing compared to anhydrous forms in industrial settings.