GB/T 18942.1-2003 specifies the determination method of compressive stress-strain characteristics of polymer porous resilience low density materials. It specifies the applicable range of low density materials and details the sample prepative requirements, such as size, shape, etc. Specify the equipment required for testing, standardize the compression operation process, cover key steps such as loading rate and displacement control, and also specify the calculation and representation of the results. The measurement can understand the material compressive performance and provide a basis for product design and mass control. This standard provides a unified testing specification for the industry, helps to improve product mass, and promotes the standardization development of polymer resilience porous materials industry.