Chemical name: Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate CAS No.:84434-11-7                               Molecular formula:C18H21O3P Molecular weight: 316.33                                                                                Appearance: Pale yellow viscous liquid Purity, %: ≥95.0 (GC) Clarity: Clear                                                              TPO-L is a liquid photoinitiator suitable for formulation systems with low yellowing and odor. It has a wide absorption range. In order to improve the curing effect of the surface, TPO-L is often used in conjunction with other photoinitiators The recommended uses of TPO-L are as follows: white pigmented UV-lacquers, UV screen printing inks, UV offset and UV flexo inks, overprint varnishes, paper lacquers, photoresists, printing plates, stereolithography etc. It can be used to cure paints and surfacers pigmented with titanium dioxide. Provides very low yellowing, low volatility and low odrour.  info at hhochem. com