drierite catalog and current prices. drierite desiccants are made in usa from the naturally occurring mineral, gypsum (calcium sulfate), and are available in several varieties designed to solve all types of drying problems. drierite® is an all-purpose drying agent for the efficient and rapid drying of air, industrial gases, refrigerants, organic liquids and solids. it is used to maintain a dry atmosphere in storage spaces, vaults, commercial packages, and other enclosures; and for the protection of hygroscopic materials or materials subject to mildew, corrosion, rust, or other deterioration caused by high humidity. our company complies with the buy american act and berry amendment.