Trimethylbenzoyl Diphenylphosphine Oxide is a chemical compound used as a photoinitiator in certain UV and LED-curable cosmetic products, including some nail gels and coating systems. Photoinitiators enable light-activated products to cure by initiating the chemical reaction that converts liquid materials into a hardened polymer coating.
Role in UV and LED Nail Systems
Within nail products, Trimethylbenzoyl Diphenylphosphine Oxide helps initiate rapid and consistent curing when exposed to appropriate lamp wavelengths. This process supports the formation of durable coatings used in gel polish applications, overlays, and enhancement systems. Effective curing is essential to achieving product strength, surface stability, and wear resistance.
Regulatory Developments
Following updated scientific classification under cosmetic safety legislation, Trimethylbenzoyl Diphenylphosphine Oxide is being removed from cosmetic use within the European Union and Great Britain. Amendments to the UK Cosmetics Regulation mean products containing this ingredient will no longer be permitted to be newly supplied to the market after August 2026, with additional transition deadlines applying to product availability.
Further details on regulatory timelines and professional guidance can be found in our article on the TPO Ban.
Impact on Nail Professionals and Manufacturers
The regulatory change relates specifically to this ingredient rather than to gel nail systems overall. Manufacturers are reformulating products using alternative photoinitiators capable of delivering comparable curing performance while meeting updated compliance requirements.
Professional Awareness
As formulations evolve, nail professionals may notice updated ingredient listings or revised product ranges. Checking supplier communications and remaining informed about regulatory developments helps ensure continued compliance and safe professional practice.
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