What is Container Rain?
Temperature Difference
When warm, humid air enters the interior of a container and the temperature inside falls below the dew point of that air, the moisture in the air condenses into water droplets on cooler surfaces inside the container, such as the walls or roof.Cargo Cooling
The cargo inside the container may also release moisture. For example, goods that have been stored at a higher temperature before shipping can cool down inside the container, leading to the condensation of moisture.Ventilation Issues
Insufficient or improper ventilation can contribute to container rain. If the container is not adequately ventilated, the trapped moist air has limited means of escape, and condensation becomes more likely.Container rain can be problematic as it may lead to damage to the cargo, particularly goods sensitive to moisture, such as electronics, paper products, or certain types of food. To prevent container rain, proper ventilation, insulation, and the use of desiccants (moisture-absorbing materials) are common strategies. Additionally, maintaining the right temperature and humidity levels during transportation can help minimize the risk of condensation inside shipping containers.
Oct 03,2025