The physical properties of zinc make it unique and therefore a useful material to be used as cladding. Many of us are familiar with the oxidation process of steel, which forms rust. Zinc has the ability to resist corrosion due to a very unique reaction. When zinc is exposed to moisture and carbon dioxide in our atmosphere, a protective layer of zinc carbonate forms on its surface, prohibiting the corrosion process that steel experiences. This creates a beautiful bluish patina for a very desirable appearance.