When relative humidity is at least 90%, use these desiccants. They are often used to protect cargo sent in large containers from moisture.

The area covered is calculated at 77° F and 90% relative humidity.

Thirty-two 10 1/4" long desiccant bags are recommended for a 20-ft. shipping container.

22" long desiccant bags are best for large sea containers, rail cars, and river barges. They have a hanging strap and a locking carabiner, so you can secure them off the floor to save valuable floor space. Three bags are recommended for a 20-ft. shipping container.

Monitor humidity in sealed containers without opening them, protecting the inside from contamination. These plugs are often used on plastic bags, storage containers, and electrical housings. Consisting of a mounting nut and two gaskets for a tight seal, these plugs install through a hole in a flexible barrier. Remove one gasket and reverse the nut to install plugs in a rigid container. Watch the indicator disc through the nut’s viewing window—it will change color as humidity rises and falls. Made of anodized aluminum, these plugs resist corrosion and are lightweight. They meet military and SAE standards for humidity indicators.

The viewing window on reverse-mounting plugs is on the threaded side, so the nut will be threaded on the outside of your container. They’re easier to install than standard plugs.

For technical drawings and 3-D models, click on a part number.

Monitor current humidity levels in addition to maximum humidity exposure with these humidity-indicating cards that include a calibration certificate traceable to NIST that states they’ve passed a test for accuracy. The maximum humidity scale has dots that permanently change color when the humidity level reaches each humidity point. The current humidity scale is reversible and changes color as humidity increases or decreases.