Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Cytec CYASORB UV 531 Light Stabilizer

Cytec CYASORB UV 531 is a high-performance benzotriazole-based light stabilizer from the CYASORB series, widely used in polyolefins, PVC, and engineering plastics to prevent UV-induced degradation, discoloration, and mechanical property loss. It offers excellent compatibility, low volatility, and superior photostability under intense sunlight exposure.
  • cytec cyasorb uv 531 light stabilizer_ed762052
  • cytec cyasorb uv 531 light stabilizer_ed762052

Features Of Cytec CYASORB UV 531 Light Stabilizer

  1. Highly effective benzotriazole-type UV absorber with strong absorption in the 270–380 nm range.

  2. Excellent compatibility with a broad range of polymers including polyolefins, PVC, PS, ABS, and engineering thermoplastics.

  3. Good thermal stability up to 220 °C, enabling use in high-temperature processing such as extrusion and injection molding.

  4. Low volatility and minimal migration, ensuring long-term stabilization performance in thin-section and outdoor applications.

  5. Non-discoloring and maintains polymer clarity—ideal for transparent and light-colored formulations.

Typical Applications Of Cytec CYASORB UV 531 Light Stabilizer

  1. Automotive interior and exterior plastic components (e.g., dashboards, trim, bumpers).

  2. Outdoor construction materials including PVC window profiles, siding, and fencing.

  3. Agricultural films (mulch films, greenhouse covers) requiring extended UV resistance.

  4. Packaging films and containers for UV-sensitive contents (e.g., cosmetics, pharmaceuticals, agrochemicals).

  5. Consumer goods such as garden furniture, toys, and appliance housings exposed to sunlight.

Specifications Of Cytec CYASORB UV 531 Light Stabilizer

Chemical TypeBenzotriazole UV absorber
Chemical Name2-(2′-Hydroxy-3′,5′-di-tert-butylphenyl)benzotriazole
Product FormFree-flowing white to off-white crystalline powder
AppearanceWhite to pale yellow crystalline solid
Molecular Weight349.5 g/mol
Melting Point139–142 °C
Solubility (in Toluene)~200 g/L at 25 °C
UV Absorption Max (λmax)345 nm (in ethanol)


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