Food grade aluminium foil is mainly used for food and quasi-food packaging, the thickness is 0.015, 0.012, 0.009, 0.007 microns, and the aluminum alloys are 1145, 1235, 1100, 3003, 8011, 8079 etc. The performance requirements for food grade aluminium foil are strict because it is connected to the food directly. Pinholes are the most important indicator for aluminum foil for food, especially for …