What is perforated aluminum panel? Perforated aluminum panel refers to aluminum sheets that have been pressed with various hole patterns using professional CNC equipment. After the holes are punched, the panels are bent and rolled, then coated with fluorocarbon or powder coating to prevent natural oxidation of the aluminum. This is also done for aesthetic reasons, allowing for a variety of favorite colors to make the aluminum panels vibrant. Installed on buildings, they serve as decorative and beautifying elements.