Due to the electrochemical reaction, lead and copper sandwich panels will accelerate the corrosion of galvanized steel sheets. Lead cannot be used as a sandwich panel with high quality Galvalumed steel panel. Copper cannot be used as a sandwich panel with galvanized and galvanized sheets.
The recommended materials for sandwich panels are aluminum-zinc-plated substrates, aluminized zinc-plated plates, and aluminum plates. Since the Galvalumed steel panel has a short life, it should not be used as a sandwich panel with an aluminized zinc color plate. Roofing sheets produced by carbon-free rubber and aluminum plants - penetrating sandwich panels, such as exhaust ducts, can be used as sandwich panels with galvanized steel sheets.