The chloride of aluminium, also known as Chloralum, is prepared by passing chlorine, at high temperatures, over a mixture of aluminium and charcoal. By placing the anhydrou chlorides of aluminium in water, it is converted into hydrated chloride. It is said to be quite as potent as chloride of zinc or carbolic acid, and devoid of poisonous properties and unpleasant odor, and is unirritating, rendering it a useful antiseptic and disinfectant. As it does not cauterize, it is especially convenient for applications to the mouth. The taste is sharply saline, like that of alum, and its action closely approximates that of chloride of zinc.

In dental practice it has been used in the treatment of periodontitis, alveolar abscess, caries of bones, putrid pulps, alveolar pyorrhoea, and other diseases of mucous membrane.