Cyasorb UV-2337 2-(2'-Hydroxy-3', 5'-di-t-amylphenyl) benzotriazole 025973-55-1 Cytec Light stabilizer / UV-absorber >> Benzotriazole Minimal color contribution Low interaction with metals High permanence Excellent compatibility with stabilizer chemistries Minimal color contribution. Low interaction with metals. High permanence. Excellent compatibility with stabilizer chemistries