How to improve UV stability?
Last update on Jan 15, 2026
Exposure to ultraviolet (UV) radiation may cause significant degradation of polymers. This photooxidative degradation results in breaking of the polymer chains, producing free radicals. Free radicals are the culprit behind chain scission which leads to shorter polymer chains, thereby making the polymer lose its mechanical strength, flexibility etc.
What are the signs of UV damage?
Plastic degradation can be caused by several factors such as heat, water but some signs that can point towards UV damage are:
- A chalky appearance
- The component surface becoming brittle
- A change in the material's outer color appearance
You can expect that with continuous exposure for a prolonged period, the plastic components can fail altogether.
Schematic overview of photo-oxidative reactions, starting with a virgin plastic sphere (left), and leading to fragmentation (top right) and / or surface ablation (bottom right) of plastics3
Check out the science behind UV resistance >>
Formulation strategies
- Yousif, Haddad. (2013). Photodegradation and photostabilization of polymers, especially polystyrene: review. Springerplus.
- (2019). UV and its effect on plastics: an overview. Essentra Components.
- Andrady, Barnes, Bornman, Gouin, Madronich, White, Zepp, Jansen. (2022). Oxidation and fragmentation of plastics in a changing environment; from UV-radiation to biological degradation. Elsevier.