Cheng

Retort Packaging: Ensuring Flex Durability Using Flex Tester and ASTM F392 Gelbo Flex Method Retort packaging has become an essential solution for high-temperature food sterilization processes, offering long shelf life without refrigeration. Found in ready-to-eat meals, soups, sauces, and even pet foods, this packaging must endure harsh thermal processing and repeated handling without compromising its barrier properties. A key factor in maintaining seal integrity and product safety is the material’s flex durability, tested using a flex tester based on the Gelbo flex motion defined in ASTM F392. In this article, we’ll explain why flex durability matters for retort packaging, introduce the ASTM F392 standard and Gelbo flex test, and recommend […]

Inner Sealing Layer Flex Durability and Barrier Performance In flexible packaging, the inner sealing layer plays a pivotal role in maintaining product integrity, especially during transportation and handling. This layer must not only form a reliable heat seal but also resist damage from mechanical stress like folding, crumpling, or twisting. To ensure high performance, manufacturers rely on standardized tests such as the gelbo test method (ASTM F392) and specialized instruments like the flex durability tester. Durability of the inner sealing layer is particularly critical in food, pharmaceutical, and medical packaging. A compromised inner layer can result in leakage, contamination, or even total seal failure, leading to product loss and decreased