It is used in uv coating,uv ink,uv varnish,uv resin ... ° CUsage: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide is called the photo initiator TPO. It is one of the most important free radical ... centimeters * height 55 centimeters Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide