Abstract: A process for preparing fluoropolymer dispersions, substantially anionic fluorinated surfactant free, comprising: step a1) to a fluoropolymer dispersion it is added: a nonionic surfactant having cloud point (CP) between 40°and 80° C., in an amount from 1.5% to 50% by weight, with respect to the fluoropolymer of the dispersion; step a2) heating of the dispersion up to a temperature Tc comprised in the range CP±10° C.; step a2?) decantation in a reactor at the temperature Tc, until obtaining: a lower aqueous phase formed of the concentrated fluoropolymer dispersion, an upper aqueous phase substantially not containing fluoropolymer; step a3) washing of the decanted dispersion obtained in a2?) with a solution of water and nonionic surfactant, wherein the concentration by weight of the surfactant in the solution is from 0.