In coatings, UV exposure is the main cause of aging and failure. Prolonged sunlight leads to yellowing, fading, gloss loss, chalking, cracking, and reduced adhesion—shortening coating life and lowering product quality.

During polymer processing, high temperatures can easily cause thermal oxidative degradation, leading to yellowing and reduced mechanical properties.

In optical films, displays, LED lighting, and protective eyewear, UV and blue light are major causes of yellowing and aging over time.