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Banned thiourea (CMR)

Imidazolidine-2-thione (Ethylene thiourea)

CAS 96-45-7
5

Safety score · 0–100

Avoid

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

Ethylene thiourea (imidazolidine-2-thione) is a CMR-classified rubber accelerator prohibited from any cosmetic use in the EU due to suspected carcinogenicity, reproductive toxicity and skin sensitisation concerns.

Skin benefits

  • Used as accelerator in rubber and resin manufacturing
  • No legitimate cosmetic benefit; listed as banned reference substance

Known concerns

  • Listed in EU Cosmetics Regulation Annex II as prohibited
  • Classified as Carc. 2 and Repr. 1B under EU CLP
  • Suspected of damaging fertility and the unborn child
  • Skin sensitiser and target organ toxin

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

Check your shelf

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.