Industrial grade aluminum foil has thickness of 0.005 to 0.2 mm, it is mainly used in electrolytic capacitors, thermal insulation materials, moisture-proof materials, cigarettes, food, pharmaceutical packaging and cables. The chemical composition of industrial aluminum foil should meet the requirements. Harmful elements of industrial aluminum foil for food and medical packaging shall comply with regulations. The inspection of aluminum foil quality mainly includes geometric dimension inspection, appearance quality inspection, intrinsic quality inspection and mechanical performance inspection.
When the user has requirements on the mechanical properties of general industrial aluminum foil (except for aluminum foil for cables). The room-temperature longitudinal mechanical properties of aluminum foil for cables shall meet the requirements. The thickness deviation of any point of the industrial aluminum foil shall meet the requirements. The width deviation of the aluminum foil should meet the requirements. The diameter of the aluminum foil is determined by the supplier and the buyer through consultation. The width of the die should be equal to or greater than the width of the aluminum foil, but not more than 5mm.
The surface of the industrial aluminum foil should be clean and flat, and no defects that affect the use such as corrosion and slitting are allowed. Minor oil marks, waves, wrinkles, and print marks that do not affect the use are allowed. The aluminum foil should have no oil spots on the surface, and the surface brushing test should reach B or A level. The surface of medicinal aluminum foil should have as little oil as possible, and the surface wetting tension value should not be less than 32X10-‘N / m. The surface of the industrial grade aluminum foil is allowed to have pinholes visible to the naked eye, but the pinholes must not be closely packed. The diameter of pinholes for medicinal aluminum foil shall not be greater than 0.3mm, and shall not exceed 5 / m2. The pinhole size of other industrial pure aluminum foil should not exceed 0.5mm.