What is the chemical composition of aluminum foil facing?

Aluminum foil facing is primarily composed of aluminum, which is a lightweight, malleable, and ductile metal with the symbol Al and atomic number 13. It is commonly used in construction, packaging, and cooking due to its excellent thermal and electrical conductivity, as well as its resistance to corrosion. The aluminum used for foil is typically of high purity, but it may also contain trace amounts of other elements to enhance certain properties, such as copper to improve strength or magnesium to increase resistance to corrosion. The facing can also have a protective layer or coating to prevent oxidation or to enhance its performance in specific applications.