Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

IGM Omnirad 4265 UV Photoinitiator

IGM Omnirad 4265 is a high-synergy binary blend Type I free radical UV photoinitiator in the Omnirad series, designed for UV radiation curing systems. Its core is a 50:50 ratio blend of diphenyl(2,4,6-trimethylbenzoyl)-phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one. It can efficiently decompose to generate free radicals under UV light, quickly initiating photopolymerization of unsaturated prepolymers such as acrylates with mono and multifunctional vinyl monomers

Features Of IGM Omnirad 4265 UV Photoinitiator

  1. Binary component synergy - 50:50 blend ratio, two components complement each other, initiation efficiency far exceeds single photoinitiator

  2. Efficient and comprehensive curing - Fast and uniform surface and deep curing, reducing incomplete curing problems

  3. Broad-spectrum compatibility - Suitable for acrylate systems, compatible with solvent-based UV formulations, strong versatility

  4. Low-yellowing property - No obvious yellowing after curing, suitable for light-colored, transparent and pigmented systems, good decorativeness

  5. Easy processing and addition - Solid powder form, easy to weigh, store and transport, convenient dispersion, not easy to agglomerate

Typical Applications Of IGM Omnirad 4265 UV Photoinitiator

  1. Transparent UV varnishes - Transparent varnishes for wood, glass and plastic, maintaining high light transmittance, not easy to lose light after long-term use

  2. Pigmented UV coatings - Wood, plastic pigmented UV coatings, uniform curing, improving coating wear resistance and decorativeness

  3. UV ink field - Screen, offset inks, suitable for paper, plastic, metal substrates, high printing precision

  4. Plastic coating field - UV coatings for plastic products, good fit, no impact on plastic performance

  5. General UV curing - UV curing adhesives and prepolymer systems, suitable for various substrates, reliable performance

Specifications Of IGM Omnirad 4265 UV Photoinitiator

AliasPhotoinitiator 4265, PI4265
CAS No75980-60-8 + 7473-98-5
Appearance (25°C)White to pale yellow crystalline powder
Purity≥98.0%
Molecular Weight348.37 g/mol + 164.20 g/mol
Melting Point70-78°C


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