Is Methyl Perfluoro Butyl/Isobutyl Ether safe in cosmetics?
Methyl Perfluoro Butyl/Isobutyl Ether has a safety rating of "MODERATE" in our database. EU status: permitted. US status: permitted.
Moderate
Cosmetic Ingredient
Methyl Perfluoro Butyl/Isobutyl Ether
INCI: METHYL PERFLUOROBUTYL ETHER (THE COMMERCIAL MIXTURE IS TYPICALLY LISTED UNDER THIS NAME, AS IT CONTAINS BOTH ISOMERS)
Methyl Perfluoro Butyl/Isobutyl Ether (CAS 163702-07-6 (covers the commercial mixture of n-butyl and isobutyl isomers)) is a cosmetic cosmetic ingredient functioning as Solvent, Viscosity Controlling Agent. EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database.
Auto-generated CPSR Part A draft with source citations
CAS Number
163702-07-6 (covers the commercial mixture of n-butyl and isobutyl isomers)
View industrial chemical safety profile →
Function
Solvent, Viscosity Controlling Agent
Safety Rating
MODERATE
Regulatory Status
EU EU Status
permitted
US US Status
permitted
US Notes
Allowed but flagged as a PFAS ingredient in cosmetics. Under MoCRA Section 3(9), FDA was mandated to assess PFAS safety in cosmetics and publish findings by December 29, 2025.
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Methyl Perfluoro Butyl/Isobutyl Ether.
Calculate MoS for your specific formulation with the MoS Calculator.
Expert Verdict
Expert safety assessment and concern-level summary for Methyl Perfluoro Butyl/Isobutyl Ether.
Frequently Asked Questions
Is Methyl Perfluoro Butyl/Isobutyl Ether allowed in the EU?
Methyl Perfluoro Butyl/Isobutyl Ether EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does Methyl Perfluoro Butyl/Isobutyl Ether do in cosmetics?
Methyl Perfluoro Butyl/Isobutyl Ether functions as: Solvent, Viscosity Controlling Agent. It is classified as a cosmetic ingredient in our database. CAS number: 163702-07-6 (covers the commercial mixture of n-butyl and isobutyl isomers).
Compliance Tools
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Substance Compliance
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MoS Calculator
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Heavy Metal Limits
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