Perforated aluminium panel is a single layer solid aluminium panel, surface to be punched or laser cut to get holes to create a certain decorative pattern. And the panel can be in a form of flat panel, or farbicated into a cassette panels or even irregular shape panels. Eventually the panel will be coated with a required color as per the building curtain wall design. The way to make the surface coating can be either powder coating, or spray coating.