UV-327 by Zhiyi Specialty Chemicals 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol. Acts as a highly effective light stabilizer for a variety of plastics and other substrates. Due to its red-shifted UV absorption, is particularly suited for use in the stabilization of polymers that are especially sensitive to long-wavelength UV radiation and in certain applications where very low transmission of long-wavelength UV radiation is required (e.g. optical lenses).
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