Container rain refers to moisture condensation inside a shipping container that occurs when warm, humid air cools down and forms water droplets on the container’s interior surfaces. As temperatures fluctuate during transit, this condensation can drip onto goods, leading to mould growth, rust, corrosion, and packaging damage. When the container is exposed to temperatures below the dew point, the moisture from the ambient air will condensate, which is visible at the ceiling and walls of the container. This water will then drip onto the cargo.
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Container rain is a major concern in international shipping, particularly for long-distance freight, ocean shipments, and containers crossing multiple climate zones. Without proper moisture control, it can lead to significant financial losses due to damaged products.