Sinocure Chemical Group Co.,Ltd.

Sinocure® Photoinitiator

Sinocure® 250

Sinocure® 250 is a versatile photoinitiator for cationic polymerization of epoxy- or oxetane-based photocurable systems upon light exposure. It can be used to effectively cure cationic inks and coatings,e.g., printing inks, white base coatings and adhesives. Omnicat 250 is especially suitable to the cure thick and highly pigmented systems.

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Sinocure® 250


Chemical Name:

Blend of Iodonium, (4-methylphenyl)[4-(2-methylpropyl) phenyl]-,hexafluorophosphate(1-) (75%) in propylene carbonate (25%);Irgacure 250;Omnirad 250.

CAS No: .

344562-80-7 + 108-32-7

Chemical Structure:

Absorption Spectrum:


Appearance Brown or sorrel liquid
Assay ≥75.0%
Purity ≥98.0%
Isomer ≤2.0%



Sinocure® 250 may be used alone or in combination with suitable photosensitizers, such as thioxanthones, in UV-curable inks and varnishes for application on paper, metal, wood, plastic materials and adhesives.

When used in combination with α-hydoxyketones, excellent surface curing can be obtained at substantially higher line speeds.

Imaging applications in graphic arts (e.g., flexo and screen inks, white base coatings) may be of specific interest. Sinocure® 250 is also well suitable for adhesives applications.

At low concentrations, Sinocure® 250 exhibits outstanding curing performance in highly pigmented coatings and inks containing rutile titanium dioxide or coloured pigments. It affords minimum yellowing after exposure to sufficient amounts of UV radiation. In pigmented systems, a photosensitizer should be used in combinations with Sinocure® 250.

Additionally, the outstanding absorption properties of Omnicat 250 allow curing of thick sections in particular when it is used together with the appropriate sensitizer.

Formulated product properties will depend on the actual reactive monomers, oligomers and additives utilized.

Recommended Addition levels

The amount of Sinocure® 250 required for optimum performance should be determined in trials covering a concentration range :

white base coatings        1.5 – 3.0 %

flexo inks                          1.5 – 4.0 %

screen inks                       1.5 – 3.0 %

overprint varnishes        1.0 – 1.5 %

as supplied, in combination with 0.5 – 0.7 % of a photosensitizer, e.g., thioxanthones.



Sinocure® 250 is available in 20 Kg cans.


Storage & Handling

Sinocure® 250 is sensitive to visible light and any exposure to sunlight should be avoided. Opened containers should be closed after use to protect the product against light and moisture. In the presence

of certain vinyl ethers, the stability of Sinocure® 250 can be adversely affected if the formulation is exposed to elevated temperatures. Avoid contact with alkaline additives and water.

Subject to appropriate storage under the usual storage and temperature conditions, our products are durable for at least 24 months.

Sinocure® 250 should be handled in accordance with good industrial practice. Further information is provided in the material safety data sheet which is available on request.




Cas No.

344562-80-7 + 108-32-7

Chemical Name

Photoinitiator 250






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