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UV Photoiniti Photoinitiator Irgacure 819 CAS No. 162881-26-7 C26H27O3P

CAS No.:162881-26-7
Purity:99%
Place of Origin:China
MF:C26H27O3P
Appearance:Light yellow powder
MW:418.46

CATEGORY

Photoinitiator 819 (chemical name: phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide) is a highly efficient, general-purpose UV photoinitiator used to initiate the UV polymerization of unsaturated prepolymer systems. It is suitable for curing thick-film systems—particularly white systems—as well as glass-reinforced polyester/styrene systems. When used in combination with light stabilizers, it is also suitable for use in outdoor varnishes.

Product picture:

Function

Photoinitiator 819 has been tested and proven suitable for use in printing inks and pre-impregnation systems applied to surfaces such as wood, metal, plastics, paper, and optical fibers.

In white paints, colored paints, and inks containing titanium dioxide or other pigments—particularly those requiring high opacity—the addition of even a small amount of 819 imparts excellent curing efficiency and resistance to UV-induced yellowing. Furthermore, thanks to its superior absorption characteristics, 819 is well-suited for application in thick-film systems.

Photoinitiator 819 can be used in combination with other photoinitiators, such as 184 or 651. The synergistic use of 819 and 651 is particularly effective for curing polyester/styrene resin systems, such as those utilized in glass fiber-reinforced materials.

Since Photoinitiator 819 also exhibits absorption within the long-wave UV spectrum, it can be successfully paired with UV absorbers—such as TINUVIN 400—making it an ideal choice for UV-curable coatings that require robust weather resistance.