Small Desiccant Packets

Desiccant packets contain silica gel, molecular sieve, activated carbon, or clay, and are placed in sealed environments to adsorb moisture. These packs help to protect moisture-sensitive products, including foods, medical devices, and electronics, and can be used in packaging or in a closed environment such as a safe or a gun case. These sorbents are also available in bulk rather than packets.

IMPAK is a world leader in the production and distribution of moisture adsorbing desiccants. With over 100 different desiccant products, the ability to create custom blends (for instance, by mixing activated carbon with silica gel, we can create a desiccant product capable of adsorbing both odor and moisture), and competitive pricing, your options are virtually endless.

Please note that the information on this page is not meant to be exhaustive. For a more thorough overview, please refer to our Desiccant Guide page. If you have an application that requires product specifications or a blend not listed here, contact us at: (310) 715-6600

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Silica Gel Packets

Non-Indicating Silica Gel

is effectively the same as Indicating Silica Gel, except that it is white and does not change color when it has reached its moisture adsorption capacity.

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Indicating Silica Gel

changes color when it has reached its moisture adsorption capacity. Indicating Silica Gel is extremely efficient at temperatures below 77°F (25°C).

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Molecular Sieve Packets

Molecular sieves retain their ability to adsorb water molecules over a much wider spectrum of temperatures than other desiccant materials. Molecular sieves also have a much higher equilibrium capacity for water vapor under very low humidity conditions.

Molecular sieves contain a uniform network of crystalline pores and empty adsorption cavities, which give it an internal adsorptive surface area of 700 to 800 gm2 (1/2 the total volume of the crystals). Because of its uniform structure, molecular sieves will not desorb moisture into the package as readily as silica gel or clay as temperatures rise. Being synthetic rather than naturally occurring, molecular sieve is higher in cost per unit, but due to its extremely large range of adsorptive capabilities, it is often the best value.

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Activated Carbon

Activated Carbon Desiccant packets for easy odor control in packaging and storage.

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Calcium Oxide

Calcium oxide, also known as quicklime, is a type of calcinated or recalcinated lime with a moisture-adsorptive capacity of at least 28.5% by weight. Its key characteristic is its ability to adsorb significantly more water vapor at very low relative humidity levels compared to other materials. This makes it highly effective in situations requiring low critical relative humidity and high moisture concentrations.

Typical applications

• - Electronics Packaging
• - Pharmaceuticals
• - Food Storage
• - Medical Devices
• - Industrial Equipment
• - Shipping and Logistics

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Clay

Clay works effectively at temperatures below 120°F (49°C). Clay is 100% natural, non-toxic, biodegradable, and environmentally safe.

Typical applications

• - Food packaging
• - Electronic products
• - Navigational instruments
• - The storage of artifacts
• - Wireless communication equipment
• - Mechanical Parts