Desi Pak clay desiccant is a chemically inert, non-corrosive, calcium aluminosilicate clay.  The internal structure of this calcium-rich montmorillonite is a layer structure which attracts and adsorbs moisture onto its surface and between its layers.

Clay is the least expensive of all desiccants and highly effective within normal temperature and relative humidity ranges.  It is used in most industrial applications requiring humidity control.  Clay can adsorb up to 28% of its weight in water vapor at 77°F and 80% relative humidity.   At full moisture vapor capacity, Desi Pak remains dry and free-flowing.  There is no apparent change in size, shape, or texture of the desiccant.

Desi Pak unit bags exceed the requirements of Mil-D-3464E in actual performance and will exceed the moisture vapor adsorption of silica gel at government specification levels.  Desi Pak montmorillonite clay is a naturally occurring mineral as opposed to a chemically synthesized adsorbent.  Therefore, it is more economical than silica gel desiccant or molecular sieve desiccant.

The Desi Pak performance curve exceeds both the military specification, which is the industry standard, and the silica gel performance curve for these same specifications.

Desiccant Performance Data (PDF)

• Metal and machine parts
• Industrial equipment
• Pharmaceuticals
• Electronic components packaging
• Military instruments and armaments
• Aerospace
• Packaging
• Motors
• Circuit boards
• Relays and communication devices
• Oceanographic devices
• Documents and paper storage
• Instruments
• Photographic equipment and film

• Foodstuffs
• Batteries
• Vitamins
• Pet foods
• Optical devices
• Metal powders
• Powdered or beaded glass
• Bulk powdered chemicals
• Safes
• Medical equipment
• Diagnostics
• Museum storage
• Leather products
• Textiles

Tyvek^® Packets   Tyvek is made from a spunbonded olefin.  Tyvek packets are made from high density polyethylene fibers, making them extremely tear-resistant.  In addition, Tyvek is lightweight, flexible, smooth, low-linting, and is resistant to water, chemical abrasion, and aging.

Desi Pak in Tyvek packets won't promote corrosion and contains no sulfur.  Tyvek packets containing Desi Pak meet the requirements of the U.S. Food & Drug Administration for direct contact with food and pharmaceuticals.  Desi Pak in Tyvek packets is also Class 100 Clean Room compatible.

GDTII Packets  This packet material is the best value for most small packaging applications. GDTII is tear-resistant , flexible, low-linting, allows a high adsorption rate, and features good seal strength.  Desi Pak in GDTII packets is also approved by the U.S. Food & Drug Administration for direct contact with food and pharmaceuticals.

Desi Pak is available in either unit or gram sizes.

Desi Pak in unit sizes range from 1/6 unit to 80 unit bags.  (A unit of Desi Pak equals 1 ounce.)  For more information about how many units of desiccant are required to protect a given application, please refer to the Desiccant Requirements Chart: Unit Sizes or call us at 1-800-995-5590.

Desi Pak in gram size packets are typically used to protect small enclosures; they range in size from 1/4 gram to 10 grams.  For more information about Desi Pak packets, please refer to the Desiccant Requirements Chart: Gram Sizes or call us at 1-800-995-5590.

Desi Pak Clay Desiccant Method II Packaging

No matter how much care is exercised in producing a desiccant, it is only effective when it is active.  Accordingly, each pail or drum supplied by Desiccant City will contain a humidity indicator card to ensure that your desiccant is active when received and opened.  To ensure that the desiccant remains active after each opening, it is essential that the lever-lock lid be tightly resealed. 

We recommend the addition of a humidity indicator card to each enclosure being protected by Desi Pak.  A visual inspection of the card will enable one to verify that the desiccant remains active and the contents are safe.

For more information on humidity indicator cards, visit our Humidity Indicator site.