GB/T 17603-1998 specifies the outdoor exposure test method for photolytic plastics. It specifies the requirements for the selection of the test site, such as light, climate conditions, etc. The preparation of the specimen, including shape, size, etc. The test process is described in detail, covering sample installation, placement angle, regular observation, detection Frequency and other operation details. Through long-term outdoor exposure, monitor the performance changes of photolytic plastics, such as Appearance, mechanical properties, etc. The standard provides a standardized process for evaluating the degradation characteristics of photolytic plastics in practical applications, helping to develop better products and promote the environmental protection development of the plastics industry.