Cyasorb UV-5357 2-(2’-Hydroxy-3’,5’-di-t-butylphenyl)-5-chlorobenzotriazole 003864-99-1 Cytec Light stabilizer / UV-absorber >> Benzotriazole Excellent heat and light stability Low volatility Good color Superior gas fade resistance Excellent heat and light stability. Low volatility. Good color. Superior gas fade resistance.