GB/T 2 2638.7 - 2008 is the seventh part of the standard for aluminum foil test methods, dedicated to the determination of aluminum foil heat seal strength. It describes the principle of measurement, by simulating the heat seal process and applying tensile force to measure the strength of the heat seal. Specifies the technical requirements for heat sealing equipment, Tensile machine and other instruments. Detailed description of aluminum foil sample preparation, heat seal operating conditions setting, and specific steps for heat seal strength testing. Data processing and result determination methods are also standardized. This standard provides a unified specification for aluminum foil heat seal strength testing, helping to ensure the Reliability of aluminum foil Encasement in heat seal applications.