2-Hydroxy-4-n-octoxybenzophenone (CAS NO. 1843-05-6), the same name is UV-531. It absorbs 240-340 nm UV light, acts as a light stabilizer. Offers superb compatibility with polymers and other additives. It has a great protective effect on polymers, helps to reduce color, and delay yellowing and block physical performance loss. Shows cost efficiency.