2-Isopropylthioxanthone is a Type II photoinitiator. It is typically used in combination with tertiary amines. Another major use is as a sensitizer to enhance the curing efficiency of both PL-907 and PL-369. It is soluble in most monomers, oligomers and pre-polymers but insoluble in H2O.
Unit of Measure

Typical Properties

Specific Gravity

N/A 1.19

Melting Point

N/A 72 to 76 ºC161 to 169 ºF

Performance Properties

N/A Excellent sensitizer Excellent through cure Good in pigmented systems (non-whites)


N/A Pale yellow powder

Chemical Class

N/A Thioxanthone

Boiling Point

N/A >398 ºC


N/A Faint, characteristic

Abs. Peaks

N/A 255 382

Usage Levels

N/A 0.5 to 5 %

Typical Applications

N/A Coatings for graphic arts, wood, plastics, metals. Printing inks such as inkjet, flexo, screen, litho and dry offset. Adhesives.