A comprehensive reference for aluminum composite panels (ACP) covering their composition, classifications, installation methods, and maintenance guidelines to preserve their quality for many years.
Layered Composition of ACP Panels
A standard ACP panel consists of five layers: a protective top coat, an outer aluminum face 0.3–0.5mm thick, a central core (usually polyethylene or mineral materials), an inner aluminum face of the same thickness, and a protective back coat. The total panel thickness ranges from 3 to 6mm with a weight of 7–8 kg/m² for 4mm thickness. This makes it about 70% lighter than steel panels of equivalent stiffness, significantly reducing loads on the supporting structure.
Core Classification and Its Security Importance
The core is the primary determinant of the panel's fire resistance. Standard polyethylene-core panels (PE Core) are combustible and support flame spread on facades, and have been responsible for fire disasters in prominent buildings. In contrast, mineral-core or flame-retardant-core panels (FR Core) are classified A2 or B per EN 13501-1 and effectively resist fire spread. The golden rule today: PE-core ACP panels must not be used on any building exceeding two floors outside uninhabited zones, and many modern codes prohibit their use on facades entirely.
Main Installation Systems
ACP panels are installed using three common systems. The riveted frame system fixes panels to an aluminum or galvanized steel subframe with screws or hidden fasteners. The cassette system folds panel edges into a rigid tray fixed with brackets, enabling easy removal and replacement. The drained and ventilated system leaves a ventilation gap between the panel and the wall to manage condensation moisture and prevent buildup. Each system has its own structural calculations based on the calculated wind load.
Long-Term Performance
ACP panels with aluminum faces coated in PVDF (Polyvinylidene Fluoride) enjoy a service life exceeding 25 years while retaining more than 90% of the original color per approved testing standards. PVDF coating is resistant to UV radiation, atmospheric pollution, and acid rain, making it the preferred choice in exterior projects. In contrast, polyester (Polyester) coating is less expensive but has a shorter lifespan and tends to fade over time in hot and sunny environments.
Cleaning and Periodic Maintenance
Properly cleaning ACP panels prolongs their life and maintains their distinctive appearance. The general recommendation is washing with clean water and a neutral mild detergent once or twice a year, avoiding alkaline, acidic, or abrasive cleaners that damage the coating layer. An annual inspection of fixing points and rubber sealants is advised, verifying their integrity and absence of cracks, as any water infiltration behind the panels leads to corrosion of the supporting substructure over time.
