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Printable Literature
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Desiccant Performance Data |
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Desi Pak® Moisture Adsorbent |
| Desi
Pak 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. 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. At 70% RH and 75°F, Desi Pak
adsorbs over 20% of its weight in water. This is accomplished in approximately 6
hours. (Refer to Exhibits 1 and 2). |
 Exhibit #1
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Exhibit #2
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Sorb-It® Moisture Adsorbent |
| Sorb-It
packaged silica gel is made from amorphous silicate. It is a hard, translucent
material with an extremely high capacity for moisture at temperatures below 75° and at
humidity levels above 40%. Sorb-It is
designed to control moisture levels within packaged products. The function of
Sorb-It when controlling moisture is like a tiny sponge with millions of microscopic
pores. Under very low humidity conditions, a small amount of water vapor will be
adsorbed in the smallest pores. As humidity increases, the larger pores will begin
to fill. For example, at 20% RH and 75°F, Sorb-It can adsorb 12% of its weight in
water. At 80% RH and 75°F, it can adsorb 35% of its weight in water (see Exhibit
3). Unlike a sponge, however, Sorb-It remains dry even at maximum capacity. In
addition to adsorbing more at higher humidity levels, Sorb-It will also adsorb more as the
time period increases. For example, at 70% RH and 75°F, Sorb-It can adsorb 15% of
its weight in water within two hours and reach adsorption capacity within eight hours (see
Exhibit 4).
NOTE: Desi Pak and Sorb-It packaged desiccants by
United Desiccants are qualified under Mil D-3464 Type I and II for use in Method II
Packaging Mil P-116. (Certificate of compliance furnished upon request). |
Exhibit #3
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Exhibit #4
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Getter® Odor/Gas Adsorbent |
| Getter consists of activated
carbon and is used in controlling objectionable odors and gases within packaged
products. These odors and gases are removed through the process of adsorption. Many products contain gas and odor molecules of an objectionable nature.
These molecules are readily adsorbed by Getter because:
- They are heavier than most other types of molecules.
- Their chemical nature draws them to the activated carbon located within
the Getter Package.
Through adsorption, Getter protects several types of products ranging
from pharmaceuticals to electronics. Exhibit 5 illustrates the percent pick-up of
Carbon Tetrachloride versus time, using Getter at 75°F. |
Exhibit #5
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Tri-Sorb®
Moisture/Gas Adsorbent |
Tri-Sorb molecular sieves
originating from zeolite compounds are synthetically produced crystalline metal
alumino-silicates used for adsorption. They are unique to other adsorbents because:
- They adsorb molecules on the basis of polarity differences due to
electrostatic attraction.
- They have a uniform pore structure which enables them to separate
molecules by size.
Water molecules, for example, are adsorbed strongly by Tri-Sorb because
they possess a higher degree of polarity and have the proper molecular size for entrance
into the sieves' pores.
The structure of Tri-Sorb provides a higher capacity for water
adsorption than either silica gel or clay at low humidity levels. Exhibit 6 compares
the adsorption capacity of Tri-Sorb with silica gel and clay at varying humidity levels.
Tri-Sorb also retains a higher percent of moisture capacity than either
silica gel or clay as temperature levels increase. Exhibit 7 compares this
relationship. |
Exhibit #6 |
Exhibit #7
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2-in-1TM
Moisture and Odor/Gas Adsorbent |
| 2-in-1 is a combination of
silica gel and activated carbon packaged together for use in controlling moisture, gas and
odor within packaged products. As a moisture adsorbent, 2-in-1
attracts the excess water vapor that is present within the package. Under even very
low humidity conditions, a small amount of water vapor will settle in its sponge-like
pores. As humidity increases, the larger pores will begin to fill and adsorb the
remaining moisture.
Simultaneously, 2-in-1 will adsorb gas and odor molecules. These
molecules are readily adsorbed because:
- Gas and odor molecules are heavier than most other molecules.
- They are chemically attracted to the carbon located within the 2-in-1
package.
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The Controlled Atmosphere Packaging Experts Call us at 800-763-1969
