Isothermal vapour-liquid equilibrium data have been measured for the R32 + RE170 binary system at seven temperatures between 283.03 and 363.21 K, and pressures between 0.5 and 5.5 MPa. The experimental method used in this work is of the static-analytic type, taking advantage of two pneumatic capillary samplers (Rolsi (TM), Armines' patent) developed in the CEP/TEP laboratory. The data were obtained with uncertainties within +/- 0.02 K, +/- 0.0002 MPa and +/- 1% for molar compositions. The isothermal P, x, y data are well represented with the Peng and Robinson equation of state using the Mathias-Copeman alpha function and the Wong-Sandler mixing rules involving the NRTL g(E) model. (c) 2005 Elsevier B.V. All rights reserved.