In this paper, a new theoretical model is presented for the sublimation of graphite at hypersonic flight speeds. The aerothermochemical interactions between dissociated air and graphite are treated by means of a nine-component model, including O, O2, N, N2, CO, CO2, C, C3, and CN. The mass-transfer rate, the heat-transfer rate, and the skin-friction coefficient are determined numerically and are then correlated by means of algebraic equations as a function of stagnation pressure, stagnation enthalpy, and wall temperature in the high-Reynoldsnumber stagnation-point flow regime.