Aluminum Honeycomb Panels McMaster-Carr
A honeycomb core is bonded between two aluminum sheets for rigidity. These panels offer a higher strength-to-weight ratio than solid sheets so they're often used as a lightweight alternative to solid aluminum. They're also used for sound insulation. They are painted white and covered with a protective peel-off film. 3000 series aluminum stands up to outdoor use as well as exposure to chemicals.
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