A new circulation-type vapor-liquid equilibrium (VLE) apparatus was developed, and two binary systems of pentafluoroethane (R125) + propane (R290) and pentafluoroethane (R125)+1,1,1,2,3,3,3-heptafluoropropane (R227ea) were measured. The estimated uncertainties of the measured data are +/- 0.005 K for temperatures, +/- 600 Pa for pressures, and +/- 0.001 for mole fractions for both the liquid and vapor phases. The VLE data for the R125 + R290 system were used to validate the experimental setup by comparing with the literature ones. The experimental VLE data for the two measured systems were correlated using the Peng-Robinson equation of state with the classical mixing rules. The two systems were further described using predictive model. (C) 2009 Elsevier B.V. All rights reserved.