An aluminum composite panel (ACP) is a sandwich panel structure made up of two thin aluminum sheets bonded to a non-aluminum core, typically made of polyethylene (PE), polyurethane (PU), or mineral-filled core. These panels are commonly used for building cladding, exterior wall facades, and signage.

The aluminum sheets on either side of the panel are coated with a paint or resin that provides a decorative finish and protects the metal from corrosion. ACPs are lightweight, durable, and easy to install, making them a popular choice for both residential and commercial applications.

However, there have been concerns raised about the fire safety of ACPs, particularly those with a PE core, which can ignite and spread flames quickly. As a result, some countries have banned or restricted the use of ACPs in high-rise buildings. It is important to consult with local regulations and building codes before selecting and installing ACPs in any construction project.