Aluminum foil is processed into sandwich panels and It's widely used for central air condition duct/Hybrid ventilation duct,like hospital,supermarket,hotel and more public place. This foil is more and more populare with buyers,as our foil is Green & Environmental protection,no pollution and our coating is water-based paint without pollution and our foil has anti corrosion coating( weatherproof and ultraviolet ray protection polyester lacquer).