A fluorinated ether, methoxynonafluorobutane, used as a solvent and viscosity-controlling ingredient.
What it is
Methyl perfluorobutyl ether is methoxynonafluorobutane, an ether in which the butyl group is fully fluorinated, giving a volatile, low-surface-tension liquid. CosIng lists it as a solvent and a viscosity-controlling ingredient.
Where it is used
Appears on the ingredient lists of a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
The label does not show the amount used.
Functions
- Solvent
- Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).
- Viscosity controlling
- Increasing or decreasing the viscosity (thickness) of cosmetics.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.