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CAS: 125304-04-3; 23328-53-2; 104487-30-1

Liquid Benzotriazole UV Absorber


UV-571 is a liquid ultraviolet light absorber (UVA) of the hydroxyphenyl benzotriazole class which imparts good light stability to a variety of polymers.

Chemical name:

A mixture of: isomers of 2-(2H-benzotriazol-2-yl)-4-methyl-(n)-dodecylphenol; isomers of 2-(2H-benzotriazol-2-yl)-4-methyl-(n)-tetracosylphenol; isomers of 2-(2H-benzotriazol-2-yl)-4-methyl-5,6-didodecyl-phenol. n=5 or 6


2-(2H-Benzothiazol-2-yl)-6-dodecyl-4-methylphenol, branched and linear

Molecular weight:

394 g/mol

CAS number:

125304-04-3; 23328-53-2; 104487-30-1

EC number:



UV-571 can be applied in thermoplastic PUR, coating and integral foams, rigid and plasticized PVC, PVB, PMMA, PVDC, EVOH, EVA, hot cured unsaturated polyesters and spin finishes for PA, PET, PUR, and PP fibres. The product is also suitable for latices, waxes, adhesives, styrene homo- and copolymers, elastomers and polyolefins.

Common applications

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