1. 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 categorized according to the thickness of the metal foil.
2. 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.
