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A desiccant is a hygroscopic compound that induces or sustains a state of dryness (desiccation) in its vicinity. Typically come across pre-packaged desiccants are solids that absorb water. Desiccants for specialized functions may be in types besides strong, and may work through other concepts, such as chemical bonding of water molecules. They are frequently encountered in foods to keep quality. Industrially, desiccants are extensively used to control the level of water in gas streams.

Frequently when the word "desiccant" is utilized, people instantly think of the 3 primary types of desiccants: Showing Silica Gel, Molecular Sieve, and Clay desiccant. Those who have actually heard of other desiccants, like Calcium Oxide, Montmorillonite Clay and Calcium Sulfide, may or might not have a clear understanding of those desiccant types. Realizing how crucial appropriate discernment is where the use of desiccants is worried, IMPAK has developed the following recommendation to be utilized in conjunction with the information on the pages in the "Quick Links" navigation menu on the left for properly examining application requirements and choosing the appropriate desiccant for those applications. For a more extensive comparison, please refer to our Chart Comparisons page.

- Montmorillonite Clay
- Silica Gel
- Showing Silica Gel
- Molecular Screen
- Calcium Oxide
- Calcium Sulfate
- Other Adsorbents
Montmorillonite Clay

Montmorillonite clay is a naturally happening adsorbent developed by the regulated drying of magnesium aluminum silicate of the sub-bentonite type. This clay will successfully regrow for repeated usage at really low temperatures without substantial degeneration or swelling. Nevertheless, this home causes clay to quit wetness readily back into the container as temperature levels rise.


Silica Gel

Silica gel is silicon dioxide (SiO2). It is a naturally taking place mineral that is cleansed and processed into either granular or beaded form. As a desiccant, it has a typical pore size of 24 angstroms and has a strong affinity for moisture molecules. The silica gel will pull in wetness at temperatures approximately 220 ° F( 105 ° C). As temperature level exceeds 100 ° F, the rate of wetness pickup will slow down but the silica gel will still work.




Calcium Oxide

Calcium oxide is calcinated or recalcinated lime having a moisture adsorptive capability of not less than 28.5% by weight. The identifying function of calcium oxide (likewise referred to as quicklime) is that it will adsorb a much higher amount of water vapor at an extremely low relative humidity than other materials. It is most effective where a low crucial relative humidity is necessary, and were there is a high concentration of water vapor present.

Calcium oxide eliminates water from a bundle very gradually, typically taking days to reach its optimum capability. As calcium oxide adsorbs wetness, it swells. Appropriate desiccant product packaging is needed for reliable usage. For these reasons, its use has actually been limited to mostly the product packaging of dehydrated foods.

Calcium Sulfate

Calcium sulfate (better understood commercially as DrieriteT) is created by the regulated dehydration of gypsum. It is a general purpose desiccant tailored primarily towards lab usage. It is chemically stable, non-disintegrating, nontoxic, non-corrosive and does not release its adsorbed water easily when exposed to higher ambient temperatures.

The low cost of calcium sulfate should be weighed against its equally low adsorptive capability; it adsorbs just as much as 10% of its weight in water vapor. Calcium sulfate also has regrowth attributes that tend to limit its beneficial life. Although readily available, it is not usually sold in package type.

Other Adsorbents

Other adsorbents are offered for specific functions. Triggered alumina is a permeable desiccant which carries out very likewise to silica gel, providing somewhat lower moisture capability at low temperature levels, however slightly improved capacity at greater temperatures. It ought to be noted that some of these alternative desiccant items have a specialized function.

Activated alumina is incredibly effective for drying gases. Triggered carbon has been utilized extensively for several years as an adsorbent of smells and poisonous gases - it has long been used in military gas masks.

Others, varying from metal salts to phosphorus compounds, have specific strengths that would be difficult to address individually. Frequently it is left up to the desiccant supplier to address particular questions.

The Green Book leading industrial, commercial, and consumer directory in Singapore offers various Desiccants from different Companies that can attend to various Desiccant needs fast and easy.

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