The reclassification underlines the growing importance of safer and more sustainable solutions in the industry. IGM Resins affirmed its commitment to guiding partners through this change with reliable alternatives.
IGM Resins has announced that 1-Hydroxycyclohexyl-phenyl ketone (CAS no. 947-19-3), commercially known as Omnirad® 184 and Omnirad® 184D, has been reclassified as a Reproductive Toxicity Category 1B substance under EU REACH regulations. The photoinitiator, widely used in the energy curing industry for its consistent performance across diverse applications, is registered in Europe by IGM Resins under Annex IX.
“The new toxicological results are showing that the product is a reprotoxic substance. As a result, Omnirad® 184 is now reclassified with immediate effect as Reproductive Toxicity Category 1B under EU REACH regulations. This regulatory shift introduces new compliance obligations for formulators and manufacturers, especially in Europe and North America,” has stated the company.
The reclassification follows additional in vivo genotoxicity testing (OECD 414) required by the European Chemicals Agency (ECHA), for which IGM Resins acted as lead registrant. This regulatory change is expected to impact the handling and use of Omnirad® 184 across the industry.
IGM Resins emphasised its commitment to supporting customers in identifying suitable alternatives. “While a universal substitute may not suit every formulation, we recognise the importance of offering options that align with both performance needs and regulatory compliance. Thanks to our constant innovation and ongoing development of photoinitiators, iGM Resins is well positioned to offer a broad range of solutions, from standard products to advanced, high-performance alternatives.”
The company recommends the following options:
- Omnirad® 1173 – A low molecular weight photoinitiator with good reactivity under Hg-lamp, low yellowing, excellent formulation compatibility, and liquid form for easy handling. Its higher evaporation rate may result in easier dirty collection on lamps and a stronger perceived odour during use. Produced at IGM Resins’ Mortara, Italy site, it offers reduced delivery times in Europe and a complete Life Cycle Analysis.
- Omnirad® 601 – A solid photoinitiator suited for applications requiring high reactivity and very low yellowing. Its higher molecular weight and functionality lead to reduced odour and emissions, though solubility is more limited than Omnirad® 184.
- Omnirad® 2509 – An intermediate, economical liquid photoinitiator that delivers good surface cure, low yellowing, and formulation stability for both inks and clear varnishes.
Omnirad® 184 belongs to the class of alpha hydroxy ketones (AHK), which are Type I photoinitiators. IGM Resins offers a range of mono- and di-functional AHK products, with the full list available in its product brochure.
“IGM Resins’ technical experts are ready to support customers in identifying the most suitable alternatives to Omnirad® 184. We work case by case, ensuring each application—whether in coatings, inks, or adhesives—receives a tailored approach. This includes formulation guidance, performance testing, and regulatory advice to ensure minimal disruption during the transition,” has added the company.