Aluminum-ZINC coatings on steel
The aluminum-zinc coating commonly known by the trademark name "Galvalume", a sheet steel product formerly developed by Bethlehem Steel Corporation. Other trade names for the product are Zincalume (Australia), Aluzink (Sweden), and Galvalange S.r.a.l. (Brazil).
This product was developed specifically for the roofing and flashing market as an alternative to the widely used galvanized steel sheet. Galvalume involves passing high tensile strength steel through a molten bath of aluminum-zinc alloy metal.