Equilibrium chemistry has been demonstrated to give reasonable predictions of the equation of state of the reaction products of energetic materials. One advantage of chemistry-based equations of state is the possibility of predicting a reasonably accurate temperature, which is essential for use with detailed models of reactive flow. A framework for reactive flow modelling is presented which allows improved equations of state to be used with more rigorous representations of unreacted and partially-reacted explosive, and with models of phenomena occurring in non-ideal explosives, such as the late release of energy by carbon condensation. ©2000 American Institute of Physics.