Vapor pressures of exo- and endo-tetrahydrodicyclopentadiene (THDCPD) were measured by using dynamic glass still at T=335-463 K. The experimental vapor pressures were fitted well with the Antoine equation. Isobaric vapor-liquid equilibria for the binary system exo-THDCPD + endo-THDCPD were determined by a using dynamic method at six constant pressures of 10, 30, 50, 70, 90 and 101.3 kPa. All the VLE data sets were correlated with NRTL model. Additionally, densities and viscosities at 288.15, 298.15, 308.15 and 318.15 K for the same binary mixtures were measured by using a vibrating tube density meter and a precision viscometer, respectively. (c) 2006 Elsevier B.V. All rights reserved.