Experimental vapour-liquid equilibrium data are reported for the binary systems of ethylene + perfluoro-n-heptane and ethylene + perfiuoro-n-nonane. Isothermal measurements were performed within the temperature range of (293-354) K, and at pressures up to 9 MPa, using an apparatus based on the "static-analytic" method. The experimental data were correlated using the Peng-Robinson equation of state utilizing either the van der Waals mixing rule or the Wong-Sandler mixing rule coupled with the Non-Random Two-Liquid (NRTL) activity coefficient model. Both model combinations provided adequate representation of the experimental data, with the model involving the Wong-Sandler mixing rule providing a slightly better fit. (C) 2016 Elsevier B.V. All rights reserved.