Among the three options you mentioned, 8079 aluminum foil is commonly used for pharmaceutical packaging due to its specific properties and characteristics. Here's why:

Purity and Cleanliness: 8079 aluminum foil is made from high-purity aluminum, ensuring its cleanliness and minimizing the risk of contamination. This is crucial for pharmaceutical packaging, where hygiene and product safety are of utmost importance.

Barrier Properties: 8079 aluminum foil has excellent barrier properties, which means it can effectively protect pharmaceutical products from external factors such as moisture, light, oxygen, and contaminants. This helps maintain the stability, potency, and shelf life of the drugs.

Flexibility: Pharmaceutical packaging often requires the foil to be flexible and easily adaptable to various shapes and sizes. 8079 aluminum foil is known for its flexibility, making it suitable for different packaging formats such as blister packs, sachets, and strip packs.

Heat Sealability: The ability to form a secure and hermetic seal is crucial in pharmaceutical packaging to ensure product integrity. 8079 aluminum foil can be easily heat sealed, providing an effective barrier against moisture and enhancing tamper resistance.

While 8011 and 8021 aluminum foils also have their applications, they may not possess the specific properties required for pharmaceutical packaging. They are often used in other industries such as food packaging, household foil, and industrial applications.

Please note that the selection of aluminum foil for pharmaceutical packaging may also depend on specific requirements, regulations, and considerations of the pharmaceutical industry。