A fully fluorinated hydrocarbon used as a solvent, detangling and skin-conditioning ingredient.
What it is
Perfluorodecalin is octadecafluorodecahydronaphthalene, a decalin molecule in which all hydrogen atoms have been replaced by fluorine; it is a perfluorinated compound. CosIng lists it as a detangling, skin-conditioning and solvent ingredient.
Where it is used
Found in creams, serums, eye products and some hair care 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 concentration used.
Functions
- Detangling
- Reducing or eliminating hair intertwining due to hair surface alteration or damage and, thus, helping combing.
- Skin conditioning
- Maintaining the skin in good condition.
- Solvent
- Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

