The DIN 53509-0 standard is used to determine the Stability of rubber against ozone checking, with special attention to performance under static stress conditions. Developed by the German Committee for Testing Standards for Materials, the standard is based on the ISO 1431 series of standards and employs an ultraviolet photometric measurement method to determine ozone concentration. Compared to ISO 1431-1:1989, this standard makes adjustments to test Humidity, Ozone Flow rate and test time, among others. The test involves placing the rubber sample at the specified ozone concentration and elongation stress to assess its crazing production. The standard emphasizes the preparation of the sample, the test conditions, and equipment requirements to ensure the accuracy and Reliability of the test.