What material is commonly used for wall panels in a container?

The use of corrugated or flat sheet steel for wall panels in containers is primarily due to its strength, durability, and resistance to damage. Steel is a robust material that can withstand the rigors of intermodal transport, including exposure to varying weather conditions and the stresses associated with loading and unloading cargo. This material also contributes to the overall structural integrity of the container, ensuring it remains secure and functional during transit.

In addition, steel is relatively lightweight compared to other dense materials, which aids in keeping the overall weight of the container manageable for transport purposes. The design of containers often employs corrugated steel to enhance rigidity while minimizing weight, allowing for efficient stacking and stability when containers are stacked in transit.

The other materials listed may not offer the same level of performance or durability necessary for shipping containers. Wood composites, while usable in certain applications, can be less durable in harsh environments and more susceptible to moisture and insect damage. Polystyrene foam and reinforced plastics are typically used in specific contexts, such as insulation or specialized containers, but they do not provide the structural strength needed for traditional shipping and storage. Thus, steel remains the material of choice for wall panels in intermodal dry cargo containers.