DRIERITE desiccants are made 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. Forms of Drierite The granular forms of DRIERITE are available in sizes ranging from powder to 4 mesh ( 1 /4 inch granules) weighing approximately 65 pounds per cubic foot, (60 pounds per cubic foot for 200 mesh powder.) The powder is very well suited for removing the last traces of moisture from organic liquids and as an additive in polymer formulations. The most popular granule sizes are 200 mesh, 20-40 mesh, 10-20 mesh, 8 mesh, 6 mesh, and 4 mesh granules. ("Mesh" means the number of granules per inch.) Efficiency The moisture remaining in gases dried with DRIERITE at 25° - 30° C is 0.005 mg./liter, (data verified by the National Bureau of Standards). Air is dried to a dew point of -100° F. Organic liquids are dried to the low ppm range. There is little change in efficiency at temperatures up to 100° C.Drierite DESICCANTS Capacity For the drying of liquids, DRIERITE instantly absorbs 6.6 weight percent water by chemical action, creating the hemihydrate of calcium sulfate. For the drying of gases, DRIERITE has a water capacity of 10 to 14 weight percent. This increased capacity is due to combined chemical and capillary action. DRIERITE granules have 38 percent pore space volume, which accounts for the additional capacity. Above 6.6 percent, the capacity varies inversely with temperature and directly with pressure and the partial pressure of water vapor. Regeneration All forms of DRIERITE can be regenerated many times for reuse. See Regeneration of Drierite Desiccants for details.