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