Aluminium oxide is an amphoteric substance, meaning it can react with both acids and bases, such as hydrofluoric acid and sodium hydroxide, acting as an acid with a base and a base with an acid, neutralising the other and producing a salt.
A 1789 (OTTO) Aluminium oxide, α-phase, 99.99% Cas no 1344-28-1 - used in pharmaceutical and industrial manufacturing processes as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cements, available in toothpaste, as a dispersing agent food additive, and for uses in hemodialysis.