... is the basis for application of aluminium salts as flocculants in water purification. This gel crystallizes with time. Aluminium ... alumina and is used as a desiccant, an adsorbent, in gas purification, as a Claus catalyst support, water purification, and ... is very effective as a smoke suppressant in a wide range of polymers, most especially in polyesters, acrylics, ethylene vinyl acetate, epoxies ...