GB/T 41877.2 - 2022 specifies the content of molding and extrusion materials for ethylene-vinyl alcohol (EVOH) copolymers. It focuses on sample preparation and performance measurement, detailing the pretreatment of EVOH raw materials, molding and extrusion sample molding conditions to ensure that the sample is representative. In terms of performance measurement, it covers mechanical properties such as stretching and bending, as well as special properties such as barrier and thermal stability, and clarifies the corresponding test methods, instrument requirements and operation procedures. Through this standard, the performance data of EVOH materials can be accurately obtained, providing key technical support for mass evaluation, product development and application, and promoting the rational use of EVOH materials in many fields.