As they are inert, perfluoroalkanes have essentially no chemical uses, but their physical properties have led to their use in many diverse applications. These include:
*Perfluorocarbon tracer
*Liquid dielectric
*Chemical vapor deposition
*Organic Rankine cycle
*Fluorous biphasic catalysis
*Cosmetics
*Ski waxes
As well as several medical uses:
*Contrast-enhanced ultrasound
*Oxygen Therapeutics
*Blood substitute
*Liquid breathing
*Eye surgery 
*Tattoo removal