In the global automotive industry, it is common for parts to be designed in one place, made in another, and then packaged and shipped to a third place for final assembly or storage. Some places are close to each other, and some are even in the same country. But in many other cases, the places where parts are made and assembled for the last time may be thousands of kilometers away. This means that containers have to be shipped across continents or oceans. Long-distance shipments like these can be affected by big changes in the temperature and humidity of the air around the box or the auto parts inside the container. When the temperature drops quickly from 8 to 10° C (14 to 20° F), any remaining moisture in the air, even on wooden container floors, can quickly condense into "container rain." (see Figure 1). Parts sensitive to moisture, especially those made of ferrous metals, are at risk because 40% or more relative humidity levels can cause surface rust. When parts are repea...