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Retort film, also known as retort pouch film, is a type of packaging film used for the production of retort pouches, which are specially designed containers used for the sterilization and preservation of food products. Retort pouches are typically made of multiple layers of flexible laminate materials, including retort film.

Retort film is engineered to withstand the high temperatures and pressure applied during the retort process, which involves the heat treatment of packaged food to ensure its safety and extend its shelf life. The film acts as a barrier to protect the contents from moisture, oxygen, and other external factors that can affect the food's quality and safety.

The composition of retort film may vary, but it is commonly constructed with several layers of different materials. These layers can include polyester (PET), nylon (PA), aluminum foil, and polypropylene (PP) among others. Each layer has specific properties that contribute to the overall performance of the film, such as heat resistance, gas barrier, strength, and puncture resistance.

The retort film's construction allows for effective heat transfer during the retort process, ensuring that the food is thoroughly cooked and sterilized. It also helps to preserve the nutritional value, flavor, and texture of the packaged food while maintaining its appearance and preventing leakage.

Retort pouches made with retort film are widely used for various ready-to-eat meals, sauces, soups, pet food, and other products that require long shelf life and convenient heat-and-serve packaging.