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.)
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.
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.
All forms of DRIERITE can be
regenerated many times for reuse. See
Regeneration of Drierite Desiccants