GB/T 16422.2-2022 specifies the test method for exposing plastics to a xenon-arc lamp laboratory light source, which is applicable to artificial accelerated weathering tests of various plastics in a controlled environment. The standard simulates total solar radiation or solar radiation filtered through window glass using a xenon-arc lamp combined with filters. It accelerates material aging by controlling temperature, humidity, and wetting conditions, and specifies requirements for sample preparation, environmental control, and result evaluation. The core equipment includes aging test chambers, radiometers, temperature and humidity control devices, and other instruments. By evaluating indicators such as color changes and mechanical property degradation of plastics after aging, the standard provides a unified technical basis for assessing material weather resistance and predicting service life.