The present invention relates to a method for the recrystallization of the high explosives HMX and RDX. According to the invention, the explosive is dissolved in a low molecular weight, liquid (at room temperature) lactone, after which the degree of saturation of the solution obtained, is changed by either lowering the temperature or by diluting with water. This method produces, depending on the crystallization method chosen, beta -HMX crystals or RDX crystals of either 50-1500 mu m or 5-50 mu m median particle diameter respectively.
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