How to Use Desiccants Effectively

After you have identified a moisture issue, you need to determine the right desiccant to solve your moisture problem.  There are various types of moisture control products to solve for specific moisture challenges. The quantity of the desiccant needed will vary based on the volume and form of container that will be used. With many factors to consider, a Desiccant Requirement Chart can be used as a guide to determine which desiccants are ideal to solve specific moisture issues. Desiccants are only effective when used in sealed containers or closed moisture barrier packaging. 

The controlled environment allows for optimal adsorption of any vapors or moisture trapped in the sealed package. If more moisture is introduced into the package, the efficiency of the desiccant is compromised.  The level of moisture content as well as the required adsorption rate are critical factors that will also influence the choice of desiccant. For optimal humidity control, desiccants should be used in combination with a Humidity Control Card. These cards are placed inside the containers and have visual indicators of the level of moisture present. Temperature and humidity will impact the decision on the appropriate desiccant to use for certain shipping and storage conditions. 

Selecting the right desiccant can ensure your product is protected from moisture.  The type of material in the desiccant will control the cost as well as the adsorption rate. Each desiccant has unique benefits as highlighted in the examples on the comparison chart.

Desiccant Material Comparison Chart

Property

Molecular Sieve

Silica Gel 

Clay

Adsorptive Capacity at low H20 Concentrations Excellent Poor Fair
Rate of Adsorption Excellent Good Good
Capacity for Water @77° F, 40% RH High Medium Medium
Adsorptive Capacity at Elevated Temperatures  Yes No  No 
Separation by Molecular Sizes  Excellent  Poor   Poor
 

Which Desiccants are right for your moisture problem? Call us! 


Desiccants

Moisture Control

Humidity Control
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