Cyasorb UV-531 2-Hydroxy-4-n-octoxybenzophenone Cytec Light stabilizer / UV-absorber >> Benzophenone Strong UV absorption. Excellent compatibility with polymers and other stabilizer chemistries.CYASORB UV-531 light stabilizer is sanctioned by Section 178.3710 of the Food Additives Regulations for use as a stabilizer in petroleum wax at a level not to exceed 0.01 percent by weight of the wax. Strong UV absorbers which improve weatherability and service life of coatings. Enhances color stability during storage.