Isothermal vapor-liquid equilibrium data for the binary system of difluoromethane (HFC-32) +1,1,1,2-tetrafluoroethane (HFC-134a) were measured at temperature from 258.15 to 343.15 K in a circulation-type equilibrium apparatus. The experimental data were correlated with the Peng-Robinson-Stryjek-Vera equation of state using the Wong-Sandier mixing rule. The overall deviation of the pressure by the PRSV equation of state was 0.940%, and the average deviation of vapor phase composition by the PRSV equation of state was 0.0063. (c) 2006 Elsevier B.V. All rights reserved.