Sinocure® 819 / irgacure 819 / Omnirad 819 CAS 162881-26-7

Chemical Name:Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide

SynonymSinocure 920;Omnirad 819;Irgacure 819;Photoinitiator 819,BAPO.

Molecular Fomula:C26H27O3P

Molecular Weight:418.46

Appearance: Pale yellow powder

Assay: 99.0%


Photoinitiator 819 / irgacure-819 / Omnirad 819 CAS 162881-26-7


Items Specifications Results
Appearance Pale yellow powder Pale yellow powder
Assay (HPLC) ≥99.0% 99.53%
Melting point 131~135°C 131.9~132.9°C
Volatile matter ≤0.3% 0.23%
Clarity Clear conform
Conclusion The results conforms with standards

what is Sinocure® 819?

Sinocure® 819 (chemical name: Phenylbis(2,4,6-trimethylbenzoyl)phosphineoxide ) is a highly efficient general-purpose UV photoinitiator for initiating UV polymerization of unsaturated prepolymerization systems. It can be used for the curing of thick film systems, especially for white systems, glass reinforced polyester/ Styrene system. It can also be used for outdoor varnish when used in combination with light stabilizers.


Sinocure® 819 function

Sinocure® 819 has been tested for printing inks and prepreg systems on wood, metal, plastic, paper and fiber surfaces.


In high opacity white paints, paints and inks containing titanium white or other pigments, the addition of a small amount of Sinocure® 819 gives the coating excellent cure and UV yellowing resistance. Since Sinocure® 819 has excellent absorption properties, it can be used in thick film systems.


Sinocure® 819 can be used in conjunction with other photoinitiators such as IRGACURE 184 or IRGACURE 651. The combination of Sinocure® 819 and IRGACURE 651 is particularly suitable for curing polyester/styrene resin systems, such as glass fiber reinforced materials.


Since the Sinocure® 819 can be used in combination with an ultraviolet light absorber, such as TINUVIN 400, the photoinitiator 819 can be applied to a UV curable coating requiring weather resistance.


In white and thick film systems, there is the fastest cure speed. Although the yellow phase appears slightly at the time of curing, it has a photobleaching effect at a later stage.


Sinocure® 819 recommended dosage:

Clear acrylic and unsaturated polyester/styrene coatings 0.1 – 0.2% IRGACURE819 1 – 2% IRGACURE184

White acrylic and unsaturated polyester/styrene coatings 0.5 – 1% IRGACURE819 1 – 2% IRGACURE184

Colored acrylic formula 0.5 – 1% IRGACURE819 1 – 2% IRGACURE184

White Screen Printing Ink 0.5 – 1.5% IRGACURE819 1 – 2% IRGACURE184

Glass fiber reinforced unsaturated polyester/styrene prepreg 0.1 – 0.2% IRGACURE819


Safety and Operation of Irgacure 819 As an industrial chemical, the following precautions should be strictly observed:

1) Work in a clean, well-ventilated environment.

2) Wear eye masks to avoid irritation to the eyes.

3) The sensitivity of the Sinocure® 819 to visible light is determined, so direct sunlight should be avoided.

4) The product should be stored in a place where direct sunlight is avoided.


Sinocure® 819 Packaging and Shipping

Packing:20kg/carton box.

Delivery: within 5-7 working days.


Sinocure® 819 storage

Stored in a cool dry place out of direct sunlight.

Same series products

Product name CAS NO. Chemical name
Sinocure® TPO 75980-60-8 Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide
Sinocure® TPO-L 84434-11-7 Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate
Sinocure® 819/920 162881-26-7 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide
Sinocure® 819 DW 162881-26-7 Irgacure 819 DW
Sinocure® ITX 5495-84-1 2-Isopropylthioxanthone
Sinocure® DETX 82799-44-8 2,4-Diethyl-9H-thioxanthen-9-one
Sinocure® BDK/651 24650-42-8 2,2-Dimethoxy-2-phenylacetophenone
Sinocure® 907 71868-10-5 2-Methyl-4′-(methylthio)-2-morpholinopropiophenone
Sinocure® 184 947-19-3 1-Hydroxycyclohexyl phenyl ketone
Sinocure® MBF 15206-55-0 Methyl benzoylformate
Sinocure® 150 163702-01-0 Benzene, (1-methylethenyl)-, homopolymer,ar-(2-hydroxy-2-methyl-1-oxopropyl) derivs
Sinocure® 160 71868-15-0 Difunctional alpha hydroxy ketone
Sinocure® 1173 7473-98-5 2-Hydroxy-2-methylpropiophenone
Sinocure® EMK 90-93-7 4,4′-Bis(diethylamino) benzophenone
Sinocure® PBZ 2128-93-0 4-Benzoylbiphenyl
Sinocure® OMBB/MBB 606-28-0 Methyl 2-benzoylbenzoate
Sinocure® BP 119-61-9 Benzophenone
Sinocure® 754 211510-16-6 Benzeneacetic acid, alpha-oxo-, Oxydi-2,1-ethanediyl ester
Sinocure® CBP 134-85-0 4-Chlorobenzophenone
Sinocure® MBP 134-84-9 4-Methylbenzophenone
Sinocure® EHA 21245-02-3 2-Ethylhexyl 4-dimethylaminobenzoate
Sinocure® DMB 2208-05-1 2-(Dimethylamino)ethyl benzoate
Sinocure® EDB 10287-53-3 Ethyl 4-dimethylaminobenzoate
Sinocure® 250 344562-80-7 (4-Methylphenyl) [4-(2-methylpropyl)phenyl] iodoniumhexafluorophosphate
Sinocure® 369 119313-12-1 2-Benzyl-2-(dimethylamino)-4′-morpholinobutyrophenone
Sinocure® 379 119344-86-4 1-Butanone, 2-(dimethylamino)-2-(4-methylphenyl)methyl-1-4-(4-morpholinyl)phenyl-
Sinocure® 938 61358-25-6 Bis(4-tert-butylphenyl)iodonium hexafluorophosphate
Sinocure® 6992 MX 75482-18-7 & 74227-35-3 Cationic Photoinitiator UVI-6992
Sinocure® 6992 68156-13-8 Diphenyl(4-phenylthio)phenylsufonium hexafluorophosphate
Sinocure® 6993-S 71449-78-0 & 89452-37-9 Mixed type triarylsulfonium hexafluoroantimonate salts
Sinocure® 6993-P 71449-78-0 4-Thiophenyl phenyl diphenyl sulfonium hexafluoroantimonate
Sinocure® 1206 Photoinitiator APi-1206

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