- Hugoniot of C60 fullerite and the dependence of sound velocity versus pressure were measured. Experiments were carried out at pressures up to ~ 45 GPa. Hugoniot of the fullerite has several features. The transformation of C60 to a dense carbon phase is observed at the transition onset pressure ~ 15 GPa. If shock pressures higher than ~ 33 GPa, Hugoniot of C60 fullerite is determined by the thermodynamic properties of diamond-like carbon phase.