This specific compound is the hydrated potassium aluminium sulfate (potassium alum) with the formula KAl(SO4)2·12H2O
named also Potassium Alum.
Alums are useful for a range of industrial processes. They are soluble in water; have a sweetish taste; react acid to litmus; and crystallize in regular octahedra. When heated they liquefy; and if the heating is continued, the water of crystallization is driven off, the salt froths and swells, and at last an amorphous powder remains. They are astringent and acidic.
Alum can be used to make composites for crystal batteries that is a familiy of batteries with low current and long lasting.
Alum can be used as electrolyte on lead/gallium rechargeable battery (see patent 20130143113)
Alum can be used as component of a primary battery based on zinc/carbon anode/cathode (patent 2180955)
Alum can be used as a flame retardant in resin compositions where it also foam and adsorb heat trough its water of crystallization.
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