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Hydrocarbons, C4-5, if they contain > 0.1% w/w Butadiene

CAS 68476-42-6
3

Safety score · 0–100

Avoid

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

About

A C4-5 hydrocarbon fraction with potential 1,3-butadiene contamination; the butadiene impurity level triggers the EU Annex II prohibition on carcinogenic substances in cosmetics.

This hydrocarbon cut (butane-pentane range) is used as fuel or industrial solvent. Refinery streams in this boiling range are known to sometimes carry butadiene as a trace contaminant. Under EU Regulation 1223/2009 Annex II and CLP classification (EC) 1272/2008, 1,3-butadiene is a Category 1A carcinogen making any stream containing it at >0.1% w/w prohibited in cosmetic products. This ingredient has no established cosmetic function.

Known concerns

  • 1,3-Butadiene >0.1% w/w — Category 1A carcinogen, EU Annex II prohibited
  • Refinery hydrocarbon stream without cosmetic safety assessment
  • Volatile flammable mixture unsuitable for topical application

References

EU

EU CosIng database

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

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