The equilibrium pressures over C-70 were measured in the temperature range 783-904 K by the torsion effusion and Knudsen effusion methods. The obtained data are well represented by the following selected equation : log(p/Pa) = (11.38 +/- 0.15) - (9917 +/- 160)/(T/K). Assuming the vapor phase constituted by only C-70(g), the sublimation standard enthalpy of this compound, Delta(sub)H degrees(298) = 200 +/- 6 kJ mol(-1), as derived by second law elaboration of the experimental data, was derived. From the vapor pressure data, an evaluation of the free energy functions for solid C-70 has been made. The heat of formation of gaseous C-70, Delta(for)H degrees(298) = 2755 +/- 18 kJ mol(-1), was also derived.