T-BUTYL METHYL ETHER

Solvent

68

Moderate

CAS Number: 1634-04-4

About T-BUTYL METHYL ETHER

A volatile ether solvent once widely used in fuel formulations but finding limited application in cosmetics, primarily as a processing aid or extractant.

Detailed Analysis

tert-Butyl methyl ether (MTBE, CAS 1634-04-4) is primarily an industrial solvent. In cosmetics it may appear as a residual solvent from manufacturing or in specialty extraction processes. MTBE is classified by the EU as a substance of concern due to groundwater contamination potential from fuel spills, but it is not classified as a skin toxicant or sensitiser under CLP. Not listed on any EU cosmetic annexes but is restricted in certain environmental contexts under REACH.

What It Does

SOLVENT

Known Concerns

  • ⚠ Primarily an environmental concern rather than a direct skin toxicity issue
  • ⚠ Volatile organic compound (VOC) with atmospheric oxidation potential
  • ⚠ Residual solvent concern requires purity verification from manufacturers

Safety Score

68

Moderate

Based on EU regulatory data, published safety research, and ingredient function analysis.

References

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EU CosIng Database

European Commission cosmetic ingredient registry

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This information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.