Perfluorohexane

Perfluorohexane is an inert, nonpolar perfluorocarbon used as a carrier/oxygen-transport medium and slip agent; it is not pH-active and typically shows very low reactivity at cosmetic-use levels. Human and animal irritation data for perfluorocarbons generally indicate minimal skin irritation, though transient dryness/occlusion-related discomfort can occur in highly compromised skin and with repeated use. Given the goal of protecting eczema-prone patients while reflecting its low intrinsic irritancy, it fits best as very gentle rather than completely inert. Safety Notes: Perfluorohexane (a volatile perfluorocarbon solvent/oxygen carrier) is rarely used in mainstream skincare, but when present it is typically a minor oil-phase component in specialty leave-on products (e.g., barrier/soothing creams or emulsions) at trace-to-low levels around ~0.05–1% for sensorial slip and solvent effects. The highest consumer-available use levels are seen in niche, high-strength oxygenating/occlusive serums or fluid emulsions that feature perfluorocarbons as a primary phase, where perfluorohexane can reach ~10–20% while remaining OTC; rinse-off usage is uncommon and generally lower due to cost and volatility.