Final Opinion on the safety of cosmetic ingredients HEMA and Di-HEMA Trimethylhexyl Dicarbamate



1. ABSTRACT

The SCCS concludes the following:

1. In light of the data provided, does the SCCS consider monomers of HEMA and Di-HEMA-Trimethylhexyl Dicarbamate, safe at concentrations of up to 35% and 99% respectively when used in topically applied UV-cured artificial nail modelling systems?

The available evidence suggests that normal nail plate acts as a good barrier to penetration of chemical substances in general, and that both methacrylate monomers (HEMA and di-HEMA-TMHDC) polymerise rapidly under UV curing when applied as part of an artificial nail modelling system. This leaves very little chance for the monomers to be absorbed in any appreciable amount through the nail plate. In view of this, the SCCS is of the opinion that HEMA and di-HEMA-TMHDC, when applied appropriately to the nail plate at concentrations of up to 35% and 99% respectively as part of an artificial nail modelling system, are not likely to pose a risk of sensitisation, provided that their use is restricted to the nail plate only and contact with the adjacent skin is avoided.

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