From a quick internet skim, fluorocarbons are uncommon, they are used for two phase cooling (boiling and condensing). Single-phase immersion cooling is far more common e.g. Electrosafe (used in Intel’s 2012 tests [1]) is a hydrocarbon fluid.
Quote from googling: “Single phase immersion cooling fluids can come under several categories which include: hydrofluoroethers, hydrocarbons, silicon oils and water/glycol. Single phase immersion cooling has benefits over 2 phase immersion cooling, in that they tend to be less expensive both due to the liquid itself and the system used to contain them. The ease of implementation was highlighted by Varma [132] who compared Novec 7000, a 2-phase fluorocarbon-based fluid, to GRC Electrosafe, a single phase hydrocarbon based fluid”
Quote from googling: “Single phase immersion cooling fluids can come under several categories which include: hydrofluoroethers, hydrocarbons, silicon oils and water/glycol. Single phase immersion cooling has benefits over 2 phase immersion cooling, in that they tend to be less expensive both due to the liquid itself and the system used to contain them. The ease of implementation was highlighted by Varma [132] who compared Novec 7000, a 2-phase fluorocarbon-based fluid, to GRC Electrosafe, a single phase hydrocarbon based fluid”
[1] https://www.datacenterknowledge.com/archives/2012/09/04/inte...