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Hydrocarbons, C3-4, if they contain > 0.1% w/w Butadiene

CAS 68476-40-4
3

Safety score · 0–100

Avoid

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

About

A liquefied petroleum gas (LPG) fraction of C3-4 hydrocarbons with potential 1,3-butadiene contamination, classified as a prohibited carcinogenic impurity under EU cosmetic regulation.

C3-4 hydrocarbons (propane and butane fractions) are common fuel gases but as refinery streams may contain 1,3-butadiene above the 0.1% w/w threshold. Butadiene is a Category 1A CLP carcinogen and listed on EU Annex II to Regulation 1223/2009 as a prohibited carcinogenic substance for cosmetics. No SCCS opinion supports use of this broad-cut refinery stream in topical products.

Known concerns

  • 1,3-Butadiene >0.1% w/w — EU Annex II prohibited carcinogen
  • Flammable LPG fraction with no cosmetic safety profile
  • Variable composition depending on refinery source

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.