IGM Omnirad 500 is a high-efficiency compound free radical UV photoinitiator in the Omnirad series, designed for UV radiation curing systems. Composed of 50% Omnirad BP (benzophenone) and 50% Omnirad 481 (1-hydroxycyclohexyl phenyl ketone), it combines the core advantages of both. It can quickly decompose to generate free radicals when exposed to UV light, efficiently initiating the polymerization of acrylates and oligomers. Suitable for both water-based and solvent-based systems
Compound synergistic effect - Benzophenone combined with α-hydroxy ketone, initiation efficiency far exceeds single photoinitiator, faster curing
Full-system adaptation - Compatible with water-based and solvent-based UV curing formulations, extremely versatile, no separate formula adjustment needed
Liquid easy processing - Low viscosity liquid form, easy to add and disperse, can reduce overall formula viscosity and improve processing efficiency
Broad-spectrum UV absorption - Absorption range covers 250-340nm, suitable for different UV light sources, applicable to both colored and transparent systems
Benzene-free low-odor environmental protection - Benzene-free compound formula, extremely low odor, meets high-end environmental compliance, suitable for sensitive scenarios
Water-based UV coatings - Water-based UV wood paints and plastic paints, good dispersibility, stable film performance after curing
Printing ink field - Offset, screen, flexo inks, fast curing, high printing precision, suitable for various substrates
Plastic coating field - UV protective coatings for plastic surfaces, good fit, excellent scratch resistance and weather resistance
Paper coating field - Paper UV curing coatings, high efficiency curing, improving paper gloss and wear resistance
UV adhesive field - Acrylate-based UV adhesives, high bonding strength, suitable for water-based and solvent-based bonding scenarios
| Brand | IGM (Omnirad® series) |
| Chemical Type | Compound Type I/II free radical UV photoinitiator |
| Alias | Omnirad BP (50%) + Omnirad 481 (50%), Photoinitiator 500 |
| CAS No | 119-61-9 (BP) + 947-19-3 (481) |
| Appearance (25℃) | Colorless or pale yellow transparent liquid, crystallizes below 18℃ |
| Purity | ≥99.0% |
| Viscosity (20℃) | 90mPa·s |
| Density (20℃) | 1.11g/mL |
| Absorption Wavelength Range | 250-380nm (in methanol) |
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