What are the chemical properties of aluminum foil facing?

The chemical properties of the aluminum foil facing outward are primarily determined by its elemental composition, which is aluminum (Al). Aluminum is a lightweight, soft, and malleable metal with a silvery-white appearance. It is highly reactive and readily forms a thin, protective oxide layer (aluminum oxide) when exposed to air, which prevents further oxidation. This oxide layer is what gives aluminum foil its resistance to corrosion and its shiny appearance. Aluminum is also a good conductor of heat and electricity. The facing side of the aluminum foil may have slight differences in properties due to the manufacturing process, but fundamentally, it remains chemically similar to the rest of the aluminum foil.