GB/T 17603-1998

This standard specifies the procedures for exposing photodegradable plastic materials to natural outdoor weathering conditions to evaluate their degradation behavior. It is applied in the plastics industry for testing materials intended for single-use or disposable products, such as agricultural mulch films, packaging, and consumer goods, where controlled degradation upon exposure to sunlight is a functional requirement. The method is used by manufacturers and testing laboratories to verify product compliance with environmental degradation claims under real-world solar radiation and climatic conditions.