Aluminum Case vs Pelican: Impact, Water Resistance, and Total Cost of Ownership

When it comes to protecting valuable equipment during transport, two options dominate the professional market: aluminum cases and Pelican-style polymer cases. Both offer rugged protection, but they differ significantly in construction, durability, customization options, and long-term value. In this comprehensive comparison, we break down the strengths and weaknesses of each type to help you make an informed decision for your specific equipment protection needs.

Construction and Materials

Aluminum cases are constructed from aluminum alloy sheets, typically 1.0-1.5mm thick, formed into a rigid shell. The alloy used is usually 5052 or 5083 marine-grade aluminum, known for its excellent strength-to-weight ratio and corrosion resistance. The case body is riveted or welded at the seams, with reinforced corners that absorb impact energy. The lid is attached via a continuous piano hinge running the full length of the case, and closure is achieved through drawbolt latches (also called butterfly latches) made of chrome-plated steel or stainless steel.

The interior is lined with custom-cut foam (EVA, polyethylene, or polyurethane) that precisely cradles the equipment. The aluminum shell itself provides structural rigidity that does not flex under compression, making these cases suitable for stacking in cargo holds and freight transport.

Durability Comparison

Both case types offer excellent impact resistance, but through different mechanisms. Aluminum cases rely on structural rigidity – the shell does not deform, so impact energy is distributed across the entire case body. Polymer cases absorb impact through wall deformation, which can be advantageous for point impacts but may result in case wall flexing under sustained compression.

In drop tests, both case types typically protect contents from drops of 1-2 meters onto concrete. However, aluminum cases maintain their shape after impact, while polymer cases may show permanent deformation or stress marks at impact points.

Customization and Foam Options

Aluminum cases from manufacturers like Robust-Case offer extensive foam customization. The foam is CNC-routed to the exact shape of your equipment, with tolerances of plus or minus 1mm. Multi-layer foam systems can be created: a firm base layer for structural support, a custom-cut middle layer for the equipment, and a soft lid layer for top cushioning. This precision is ideal for professional equipment where exact fitment is critical.

For OEM/ODM customers, aluminum cases can be fully customized with branded foam colors, screen-printed logos on the exterior, custom colors, and integrated accessories. The aluminum shell accepts engraving, screen printing, and vinyl wraps for identification and branding.

Water and Dust Resistance

Professional aluminum cases feature neoprene or silicone gaskets around the lid opening, providing effective dust and moisture resistance. The continuous piano hinge ensures even pressure distribution along the lid seal. However, aluminum cases are generally rated for splash and dust resistance rather than full submersion. The gasket quality and compression vary by manufacturer.

Polymer cases with O-ring seals are typically rated to IP67, meaning they can withstand submersion in 1 meter of water for 30 minutes. The over-center latch mechanism applies consistent pressure to the O-ring, ensuring a reliable seal. For applications where waterproofing is the primary concern (marine, diving, flood zones), polymer cases have a clear advantage.

Conclusion

Both aluminum cases and Pelican-style polymer cases provide excellent equipment protection, but they excel in different areas. Aluminum cases offer superior customization, long-term durability, lighter weight, and professional aesthetics, making them ideal for OEM applications, air transport, and long-term professional use. Pelican-style cases excel in waterproofing and quick reconfigurability, making them better suited for marine environments and field applications where submersion protection is critical.

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