FC-75 is a fluorocarbon derivative of tetrahydrofuran with the chemical formula C<sub>8</sub>F<sub>16</sub>O. It is practically insoluble in water.
It is one of the 3M Fluorinert fluids. It is used as an inert coolant fluid in electronics and other applications, and as a solvent. FC-75 can be synthesized by the same electrochemical fluorination process used to produce PFOA. However, other perfluorinated ether isomers will also result.
A similar fluorocarbon-based coolant and solvent is perfluorohexane.