‌The characteristics of aseptic packaging materials mainly include sterility, physical strength, transparency, chemical inertness and sealing. ‌

‌Sterility‌: The material must be able to effectively block the invasion of bacteria, fungi and other microorganisms to ensure the sterile environment of the packaged items.

‌Physical strength‌: The material should have sufficient strength and durability to protect the packaged items from damage or destruction by external forces.

‌Transparency‌: The material needs to have a certain degree of transparency so that the user can clearly see the contents of the packaged items.

‌Chemical inertness‌: The material should be chemically inert and will not react with the packaged items to produce harmful substances.

‌Sealing‌: The material needs to have good sealing to ensure that the sterile environment in the package is not contaminated by external air, moisture and pollutants.

Common aseptic packaging materials include medical-grade polymer films (such as polyester films, polyether films, polypropylene films, etc.), which have good physical strength and transparency, as well as good aseptic properties; aluminum foil, which has good aseptic and sealing properties and is often used in pharmaceutical and food packaging; and composite materials, which are made by laminating different materials to combine the characteristics of multiple materials, such as polyester/aluminum foil/polyester composite materials, which are often used in aseptic packaging of medical devices.

In addition, the selection of aseptic packaging materials also considers other factors, such as cost, ease of use, and adaptability to specific applications. For example, aseptic packaging has few restrictions on packaging materials and can use a variety of packaging materials, because the packaging materials can be sterilized separately and the sterilization method can be selected according to the characteristics of the materials, so it does not need to have high heat resistance like cans and retort bags.