GB/T 7142-2002

This standard specifies a method for determining the upper temperature limit that plastics can withstand for a specified period without significant property degradation, based on accelerated thermal aging tests. It is applied in the plastics manufacturing and materials testing industries to evaluate the long-term thermal endurance of plastic materials, particularly for components used in high-temperature environments such as automotive engine compartments, electrical insulation, and industrial equipment. The standard guides engineers in selecting appropriate plastics for applications requiring reliable performance over extended heat exposure.