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Tiangang® UV-531

Benzophenone UV Absorber (BPO UVA)

Chemical name 2-Hydroxy-4-n-octoxybenzophenone
CAS number 1843-05-6
Formula C21H26O3
Description Tiangang® UV-531 is a Benzophenone type of UV absorber which imparts good light stability when used in combination with a Tiangang® HALS. It is compatible with most polyolefins, engineering plastics and PVC, and can be used to protect the polymer from degradation caused by light exposure. It can be used in combination with antioxidants, phosphites, and light stabilizers. Recommended dosing level is 0.1~0.5% based on polymer weight.

Typical properties

  Appearance Molecular Weight Melting range
Flash point
Tiangang® UV-531 Slightly yellow powder 326 48 ~ 49 > 200

Solubility @ 20oC (g/100 ml solvent)

Tiangang® UV-531 Acetone Chloroform Ethanol n-Hexane Methanol Toluene Water
43 > 50 3.5 12 2 > 50 < 0.01

Safety & handling

Tiangang® UV-531 The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool, dry, well-ventilated area away from incompatible materials.


The information supplied is presented in good faith and has been derived from sources believed to be reliable. Since conditions of use are beyond our control, all risks are assumed by the user. No representation is expressed or implied, and nothing herein shall be construed as permission or recommendation to practice a patented invention without license.