Aluminum foil used for food packaging is usually made of pure aluminum or aluminum alloys containing a small amount of alloying elements. The most commonly used aluminum alloy series are 1xxx, 3xxx and 8xxx series, which are widely used in food packaging due to their good formability, corrosion resistance and food safety.
– 1xxx series aluminum foil: This is an alloy series of almost pure aluminum (aluminum content is above 99.0%), with excellent moisture resistance, light blocking and barrier properties, which is very suitable for food packaging that requires high protection. Due to its high purity, it is very suitable for direct contact with food.
– 3xxx series aluminum foil: This series of aluminum alloys mainly enhances the strength and corrosion resistance of the material by adding manganese (Mn) while maintaining good formability. Therefore, it is also one of the commonly used materials in food packaging, especially in occasions where certain strength and good formability are required.
– 8xxx series aluminum foil: This series of aluminum alloys includes a series of alloys with other elements as the main additives, some of which are particularly suitable for food packaging applications. For example, silicon-containing alloys can improve the recyclability and heat treatment characteristics of aluminum foil.
The best aluminum foil for food packaging is usually aluminum alloy 8011 and 1235. These two aluminum alloys have excellent barrier properties, good formability and corrosion resistance, and are suitable for packaging a variety of foods.
– 8011 aluminum foil: This alloy is often used in food packaging because it has good mechanical properties and good barrier properties, which can effectively prevent the penetration of light, oxygen and moisture, thereby extending the shelf life of food.
– 1235 aluminum foil: This alloy has a high aluminum content and good ductility, which is suitable for the production of film and aluminum foil, and is commonly used in the packaging of food and medicine.
When choosing the best aluminum foil for food packaging, in addition to considering the above physical and chemical properties, it is also necessary to consider specific packaging requirements, such as whether high-temperature sterilization treatment is required, packaging form (flexible packaging or hard packaging), and cost-effectiveness. In addition, food safety is an important consideration, and all materials used for food contact must comply with relevant food safety standards and regulations.
