Two methods developed for deriving Vapor-Liquid-Equilibrium (VLE) data from isochoric measurements are presented in this paper. The first, so-called ＇flash＇ method depends on a knowledge of the volumetric properties, estimated by means of an appropriate model; in the present case, the Carnahan-Starling-De Santis (CSD) equation of state (EOS) was used to predict the mixture＇s behavior. As for the second, so-called ＇model-free＇ method, the first step is based on dew point evaluation by interpolating experimental P-T sequences. The dew point value obtained is then used to derive VLE data, again using the Camahan-Starling-De Santis equation of state. Two hundred twenty-five experimental P-V-T-x experimental data were obtained using a constant volume apparatus and 12 different binary mixture compositions prepared with the halogenated refrigerants difluoromethane (R-32) and 1,1,1,2-terafluoromethane (R-134a, in a temperature range of 240-360 K. From these experimental data the VLE properties were derived by using the two methods. A comparison of the results obtained against data in the literature shows consistent agreement within the experimental uncertainty. (C) 1998 Elsevier Science B.V. All rights reserved.