Aluminium composite panels (ACP),
made of aluminium composite material (ACM), are flat panels consisting
of two thin coil-coated aluminium sheets bonded to a non-aluminium
core. ACPs are frequently used for external cladding or facades of
buildings, insulation, and signage.
A sandwich panel is any structure made of three layers: a low-density core, and a thin skin-layer bonded to each side. Sandwich panels are used in applications where a combination of high structural rigidity and low weight is required.
Sandwich panels are an example of a sandwich structured composite: the strength and lightness of this technology makes it popular and widespread. Its versatility means that the panels have many applications and come in many forms: the core and skin materials can vary widely and the core may be a honeycomb or a solid filling.