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Solvent

T-BUTYL METHYL ETHER

CAS 1634-04-4
50

Safety score · 0–100

Moderate

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

MTBE (CAS 1634-04-4) — historically a fuel oxygenate, occasionally used as a processing solvent. Flammability, VOC profile and possible carcinogenicity concerns from MTBE literature make it a poor fit for leave-on cosmetic exposure.

Function

SOLVENT

Skin benefits

  • Processing/extraction solvent (legacy use)

Known concerns

  • Possible carcinogenicity flagged in MTBE literature
  • Highly flammable
  • Significant VOC contribution
  • Inhalation exposure concerns

References

EU

EU CosIng database

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

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Same plant / compound family

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T-BUTYL METHYLPHENOXY PHENOL
Other

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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.