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Methyl Perfluorobutyl Ether
Methyl Perfluorobutyl Ether is a mild solvent used in cosmetics to thin formulas. It is a fluorinated ether solvent that is very compatible with many other ingredients, and is thought to have good sliding properties and serve as a good solvent in oil-based formulas (Source).
Safety Measures/Side Effects:
Because Methyl Perfluorobutyl Ether is generally used for industrial, not cosmetic, purposes, little research is available regarding its effects when applied topically, or in cosmetic or beauty product formulas. It is considered a mild solvent, and is generally considered to be safe for its normal usage.