Managing Ocean Freight Container Condensation Risk through Desiccant Capacity Sizing
Calculating container desiccant capacity requires balancing cargo regain desorption wood pallet vapor release and ocean route temperature differentials.
Calcium Chloride Gel
Moisture Uptake
High performance desiccants based on hygroscopic salts provide a chemical method for reducing the relative humidity within a closed shipping container. The substance known as calcium chloride gel absorbs water vapor from the air and converts it into a stable gelatinous mass. This process prevents the liquid from leaking onto cartons of finished garments during long ocean voyages.
Phase Transition
Solid salt particles react with atmospheric moisture to trigger a transition into a liquid state before being trapped by a binding agent. Because calcium chloride gel holds several times its own weight in water, it outperforms traditional silica gel in the high heat environments of tropical ports. The gel remains stable even when the temperature inside the metal container fluctuates between day and night.
Leak Prevention
Specialized permeable membranes allow air to enter the desiccant pouch while blocking the escape of the viscous liquid inside. Using calcium chloride gel eliminates the risk of salt water stains on silk or high end cotton fabrics. These pouches are often hung from the ceiling of the container to capture moisture before it condenses on the cold walls.
Desiccant Capacity
Saturation occurs when the salt can no longer attract water molecules. Monitoring the weight of the calcium chloride gel after arrival provides data on the moisture load experienced during the shipment. Effective moisture control reduces the likelihood of mold growth on leather goods.