The temperature dependence of the coefficient of linear thermal expansion α of O2–C60 solutions with 20% and 80% filling of the octahedral cavities with oxygen is investigated in the temperature interval 2.2–24K. Hysteresis of α(T) is observed, attesting to the coexistence of two orientational glasses in these solutions. A comparison of the behavior of these glasses is made. The characteristic times for reorientation of the C60 molecules and for the phase transformations in the solutions are determined. When the temperature of the O2–C60 solution with 20mol.% oxygen is increased to 450°C, a chemical interaction of the oxygen with the C60 molecules is manifested. It proves possible to separate the influences of the chemical and physical sorption of oxygen on the thermal expansion of polycrystalline fullerite C60.