Used for rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheaths, etc., under static stretching or continuous dynamic stretching deformation, or under intermittent dynamic stretching and static stretching alternate deformation , Expose to a closed and non-illuminated air containing constant ozone concentration and a constant temperature test box, test the sample at a predetermined time, and evaluate the ozone resistance of the rubber from the degree of cracks or other changes in the surface of the sample. Aging performance.