List of 10 Most Commonly Used Photoinitiators

Common used UV photoinitiators

Photoinitiator is widely used in UV curable systems, such as adhesives, coatings, inks. It produces radicals or cations after absorbing certain UV light energy, then set off polymerization of monomers or oligomers.

In this post, i will introduce you to the 10 most commonly used photoinitiators.

Irgacure 184

Chemical Name:1-Hydroxycyclohexyl phenyl ketoneAppearance:white to offwhite crystalline power
CAS No.:947-19-3Absorption Peak:246nm, 280nm, 333nm. (In methanol solution)

Irgacure 1173

Chemical Name:2-Hydroxy-2-methyl propiophenoneAppearance:colorless to yellowish liquid
CAS No.:7473-98-5Absorption Peak:245nm, 280nm, 331nm. (In methanol solution)

Irgacure 2959

Chemical Name:
Appearance:offwhite powder
CAS No.:106797-53-9Absorption Peak:276 nm. (In methanol solution)

Irgacure 369

Chemical Name:2-Benzyl-2-(dimethylamino)-4′-morpholinobutyrophenone Appearance:yellowish powder
CAS No.:119313-12-1Absorption Peak:233nm, 324nm. (In methanol solution)

Irgacure 907

Chemical Name:2-Methyl-4-(Methylthio)-2-Morpholinopropiophenone Appearance:White to slightly brown powder
CAS No.:71868-10-5Absorption Peak:230nm, 304nm. (In methanol solution)

Irgacure 651

Chemical Name:2,2-Dimethoxy-2-phenylacetophenone Appearance:White to yellowish crystalline powder
CAS No.:24650-42-8Absorption Peak:250nm, 340nm. (In methanol solution)

Irgacure 819

Chemical Name:Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide Appearance:yellow powder
CAS No.:162881-26-7Absorption Peak:295nm, 370nm. (In methanol solution)

Photoinitiator TPO-L

Chemical Name:Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate Appearance:yellowish liquid
CAS No.:84434-11-7Absorption Peak:273nm, 370nm. (In methanol solution)

Photoinitiator TPO

Chemical Name:Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide Appearance:yellowish crystalline powder
CAS No.:75980-60-8Absorption Peak:295nm, 368nm, 380nm, 393nm. (In methanol solution)

Photoinitiator ITX

Chemical Name:2-Isopropylthioxanthone Appearance:yellowish crystalline powder
CAS No.:5495-84-1Absorption Peak:257.5nm, 382nm. (In methanol solution)

Photoinitiator MBP

Chemical Name:4-MethylbenzophenoneAppearance:White to beige crystalline powder
CAS No.:134-84-9Absorption Peak:245nm. (In methanol solution)

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