Vapor-liquid equilibrium (VLE) data for the ethane (R170) + hexafluoroethane (R116) system were measured at temperatures of (199.64, 213.06, 228.28, and 242.93) K. The measurements were carried out with an apparatus based-on the recirculation method. The measured VLE data for this binary system of R170 + R116 show azeotropic behaviors at certain compositions. The experimental results were correlated with the Peng-Robinson equation of state using the Panagiotopoulos-Reid mixing rule.