Cyasorb UV-2908 3,5-Di-tert-butyl-4-hydroxybenzoic acid, n-hexadecyl ester 067845-93-6 Cytec Antioxidant >> Phenolic Light stabilizer / UV-absorber CYASORB UV-2908 light stabilizer Minimal color contribution Low volatility Good solubility/migration balance Excellent compatibility with UV absorbers, HALS, and thioesters CYASORB UV-2908 LIGHT STABILIZER FREE RADICAL SCAVENGERb HINDERED BENZOATE Primary antioxidant (hindered phenol) for heat stabilization. High photostability compared to other primary AO’s Resistant to yellowing Does not undergo the photodimerization reaction, which generates conjugated color bodies, typical of some other primary AO’s. Does not undergo the Photo-Fries Rearrangement, which generates benzophenone color bodies, typical of other hindered benzoates. Does not react with singlet oxygen Low volatility Any high temperature cure application where there is a possibility of thermal oxidation prior to UV exposure. Any application where there is long-term outdoor heat aging. For light stabilization when used in combination with Sanduvor 3055 or Sanduvor 3058 HALS. Free radical scavenger hindered benzoate. Used as a light stabilizer and a primary antioxidant (hindered phenol) for heat stabilization. Provides high photostability and resistance to yellowing. Does not undergo photodimerization reaction and photo-fries rearrangement. Does not react with singlet oxygen. Offers minimal color contribution, low volatility, good solubility/migration balance and very good compatibility with UV absorbers, HALS, and thioesters. Suits for high temperature cure application and applications with long-term outdoor heat aging.