UV protection in plastics and polymers is often achieved using additives specifically designed to absorb or block ultraviolet radiation. Some common chemicals used for UV protection in plastics and polymers include:
UV Absorbers
These chemicals absorb UV radiation and convert it into harmless heat, thereby protecting the polymer from degradation. These additives are typically incorporated directly into the polymer matrix during processing.
| Benzophenones | Benzotriazoles |
| Hindered Amines | Triazines |
UV Stabilizers
UV stabilizers function by inhibiting the degradation of polymers caused by UV radiation. They work by scavenging free radicals generated by UV exposure, thus preventing degradation of the polymer chain. Hindered amine light stabilizers (HALS) are a common type of UV stabilizer used in plastics.
Inorganic Fillers & Additives
inorganic fillers, can provide excellent UV protection whereas other inorganic fillers are used as supporting fillers to reduce cost, when added to polymer formulations. While not as effective as dedicated UV absorbers or blockers, they can contribute to overall UV resistance.
| Titanium Dioxide (TiO2) | Zinc Oxide |
| Talc | Calcium carbonate |
Zinc oxide absorbs and scatters UV radiation, helping to protect the polymer from degradation. Micronized zinc oxide is often preferred for better dispersion and transparency in transparent or translucent polymer products.
Carbon Black
Carbon black is sometimes used in plastics to provide UV protection by absorbing UV radiation and converting it into heat. It is commonly used in applications where black coloration is acceptable.