Aluminum foil can be divided into one-side light aluminum foil and two-side light aluminum foil according to the surface state.
① Single-sided aluminum foil: double-rolled aluminum foil, one side is bright after being rolled, and one side is black. Such aluminum foil is called one-sided aluminum foil. The thickness of one side light aluminum foil usually does not exceed 0.025mm.
② Double-sided aluminum foil: single-rolled aluminum foil, both sides are in contact with the rolls, and the two sides of the aluminum foil are divided into mirror two-sided aluminum foil and ordinary two-sided aluminum foil due to the different surface roughness of the rolls. The thickness of two-sided light aluminum foil is generally not less than 0.01mm.