Isothermal vapor-liquid equilibrium data are reported for the binary system of hexafluoroethane and 1,1,1,2-tetrafluoroethane in the temperature range 263-353 K and in the pressure range 0.2-4.2 MPa. A reliable "static-analytic" method taking advantage of two online micro-capillary ROLSI (TM) samplers is used for all the measurements. The data are correlated using our in-house (ThermoSoft) thermodynamic software based on the Peng-Robinson equation of state, the Mathias-Copeman alpha function, the Wong-Sandler mixing rules, and the NRTL model. (C) 2008 Elsevier B.V. All rights reserved.