Compared with other packaging materials, aluminum foil has better moisture resistance. For example, aluminum foil with a thickness of 0.02mm or more has very few pinholes on the material surface, and its moisture permeability can be regarded as almost zero. As for aluminum foil with a thickness of less than 0.02mm, as the number of pinholes on the surface of the material increases, its moisture permeability will increase. If it is combined with paper, plastic film, etc., its moisture permeability will be greatly reduced. In comparison, it has obvious advantages in terms of moisture resistance. Therefore, aluminum foil is widely used in various packaging fields.
The soft aluminum foil annealed at high temperature for a long time can completely remove the oil stains attached to the surface of the aluminum foil, and it can also kill various microorganisms on the surface. Therefore, the soft aluminum foil is non-toxic and tasteless. It is widely used in frozen food, dry food and pharmaceutical packaging.
