GB/T 3903.8-2022 focuses on the test method for interlayer peel strength of footwear insoles, applicable to insoles made of various materials. The standard specifies the test principle and operational procedures for interlayer peel strength, with the core objective of evaluating the bonding strength between the different layers of the insole material. This reflects the insole's ability to resist interlayer separation and is directly related to the structural stability of footwear during wear. The test requires the use of an electronic universal testing machine equipped with a specialized peeling fixture. A longitudinal pulling force is applied to the specimen at a specified tensile rate, and the force data during the peeling process is recorded in real-time. Through standardized testing operations, accurate interlayer peel strength results are obtained, providing a unified technical basis for quality inspection and performance evaluation of footwear insoles.