Profile: W. A. Hammond Drierite Co. Ltd provides desiccants, laboratory, preservation & packaging products and industrial equipment. Our drierite desiccants are made from the naturally occurring mineral & gypsum, which is designed to solve all types of drying problems. Our laboratory gas drying unit is used anywhere to provide dry air or gas for blanketing, sample preparation, instrument protection, reaction mixtures, purging, vacuum release and venting with dry air.