GB/T 20236-2025 "Accelerated Outdoor Exposure Test Method for Non-Metallic Materials Using Concentrated Sunlight" is applicable for evaluating the durability of non-metallic materials used outdoors under the combined effects of solar radiation, temperature, and humidity. It specifies the accelerated outdoor exposure test method using a Fresnel reflection system. The standard clarifies technical requirements for test equipment, such as reflectivity and temperature control, and introduces an ultraviolet radiation measurement system and an irradiance calculation model. It standardizes the procedures for specimen installation, test cycles, and data processing. Specimens must maintain an airflow gap, and ultraviolet meters must be calibrated annually. Enhanced irradiance enables rapid aging testing, with results highly consistent with natural exposure conditions. This standard is suitable for evaluating the weather resistance of products such as automotive exterior components and photovoltaic materials.