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The present presentation describes the results of combustion study of binary compositions of energetic thermostable fillers (HMX, RDX, FOX 7) with two nitroester binders, which combustion obeyed two different mechanisms: a gas-phase mechanism for volatile energetic materials and a mechanism with the leading reaction in the condensed phase. The study of the combustion of binary compositions of the thermostable energetic fillers and nitro ester binders has shown that a single combustion model cannot describe the entire set of experimental conditions. Even in compositions with a varying only size of nitramine particles, combustion of the mixtures can be described by several models.