Tin foil, copper foil, aluminium foil, and other metal thin sheets are examples of foils. Foil refers to any metal sheet with a thickness of 0.2mm or less. Heavy gauge foil, medium gauge foil, and light gauge foil are categorised according to the thickness of the metal foil. The thickness ranges from 0.2mm to 0.1mm for heavy gauge foil, 0.1mm to 0.09mm for medium gauge foil, and 0.001mm for light gauge foil.
At the moment, the thinnest foil that can be rolled in an industrial setting is 0.0045mm thick. Aluminium foil currently produces the most, accounting for over 85 percent of worldwide metal foil production. China is the leading producer and exporter of aluminium foil in the world. In 2021, the output was 4050 KT, or around 65 percent of the global total.