Made from the mineral gypsum (calcium sulfate), Drierite is an all purpose drying agent for the efficient and rapid drying of air, industrial gases, refrigerants, organic liquids and solids. Drierite 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.
Forms of Drierite
The granular forms of Drierite are available in sizes ranging from powder to 4 mesh (1/4-inch granules). "Mesh" refers to the number of granules per inch. Niagara Scientific Products maintains inventory of the 4-mesh and 8-mesh varieties.
Indicating Drierite is impregnated with cobalt chloride. Indicating Drierite is blue when dry and clearly changes to pink upon absorption of moisture. This makes indicating Drierite valuable when it is necessary to know with certainty that dryness is being maintained and to signal when the drying agent should be replaced. It has the same efficiency as regular Drierite, and somewhat greater capacity due to the desiccating effect of the cobalt chloride.
All forms of Drierite can be regenerated many times for reuse. See how it's done below.