1,3-Bis(hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione
Caution
CAS Number: 6440-58-0
About 1,3-Bis(hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione
A formaldehyde-releasing antimicrobial preservative restricted under EU Annex III, with multiple hazard classifications including H302, H317, and H334.
Detailed Analysis
This compound (also known as DMDM hydantoin, a common name for a related compound) is an imidazolidine-2,4-dione derivative that releases formaldehyde upon degradation. EU Annex III listing indicates it is restricted — typical maximum concentration in rinse-off products is 0.6% (as listed in the input). Hazard classifications include H302 (harmful if swallowed), H315, H317 (skin sensitisation), H319, H334 (respiratory sensitisation). Formaldehyde-releasing preservatives are under increasing regulatory scrutiny in the EU.
Skin Benefits
- ✓ Antimicrobial preservative extending product shelf life
Known Concerns
- ⚠ Formaldehyde releaser — skin and respiratory sensitiser
- ⚠ H317 skin sensitisation
- ⚠ H334 respiratory sensitisation
- ⚠ EU Annex III restricted at max 0.6%
Safety Score
Caution
Based on EU regulatory data, published safety research, and ingredient function analysis.
References
EU CosIng Database
European Commission cosmetic ingredient registry
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