ABSTRACT
The commercial use of basic aluminum chloride solutions and powders as active ingredients in antiperspirants has undergone extensive development over the last two decades as a result of significant improvements in our understanding of the chemistry of aluminum chlorohydrate (ACH) and a wide range of activated aluminum chlorohydrates (ACH'). These developments have been the direct result of extensive scientific investigations of the hydrolysis chemistry of polycationic aluminum (III) ion species in highly concentrated aqueous solution. A previous comprehensive review (1) of the hydrolysis chemistry of commercial basic aluminum chloride (BAC) systems in 1988 provided a thorough overview of the nature of aqueous aluminum hydrolysis species in dilute solution and the more intricate macromolecular chemistry associated with highly concentrated commercial BAC solutions. In addition, this review discussed the applicability of various physicochemical and analytical approaches available to study basic aluminum chlorides systems, including aluminum chlorohydrate.
