ISO/TS 19022:2016 specifies a test method which allows predicting the aging rate of material specimens, e.g. plastics, under interest independent of the aging mechanisms as a function of radiant exposure. The UV irradiance of a simulated solar radiation (with a laboratory radiation source) will be extended above the normal maximum level on earth surface while keeping all relevant temperature parameters fixed.
NOTE For translucent plastics, the surface temperatures are below the white standard temperature. In addition, the maximum temperature is not on the irradiated surface, it is somewhere inside the plastic material.