Abstract: The present invention provides a process for obtaining a charge of hexanitrohexaazaisowurtzitane crystals having rounded morphology. It also provides said charge, the energetic material comprising it, and a process for manufacturing said material. Said process for obtaining said charge comprises: preparing a saturated solution of any polymorphic form of hexanitrohexaazaisowurtzitane in a mixture comprising both an organic solvent for said hexanitrohexaazaisowurtzitane and an organic nonsolvent for said hexanitrohexaazaisowurtzitane, said solvent being more volatile than said nonsolvent; seeding this saturated solution with a few hexanitrohexaazaisowurtzitane crystals; and then concentrating the seeded, saturated solution by at least partial evaporation of the solvent, said evaporation of the solvent being performed at a temperature of between 35° C. and 15° C.

Abstract: The present invention provides a process for obtaining a charge of hexanitrohexaazaisowurtzitane crystals having rounded morphology. It also provides said charge, the energetic material comprising it, and a process for manufacturing said material. Said process for obtaining said charge comprises: preparing a saturated solution of any polymorphic form of hexanitrohexaazaisowurtzitane in a mixture comprising both an organic solvent for said hexanitrohexaazaisowurtzitane and an organic nonsolvent for said hexanitrohexaazaisowurtzitane, said solvent being more volatile than said nonsolvent; seeding this saturated solution with a few hexanitrohexaazaisowurtzitane crystals; and then concentrating the seeded, saturated solution by at least partial evaporation of the solvent, said evaporation of the solvent being performed at a temperature of between 35° C. and 15° C.

Abstract: The present invention relates to suspensions of hexanitrohexaazaisowurtzitane crystals in a liquid phase (said liquid phase is composed, to at least 85% by weight, of a nonsolvent for hexanitrohexaazaisowurtzitane, said nonsolvent consisting of at least one nonflammable hydrofluoroether, and includes from 0 to less than 15% by weight of an organic solvent for hexanitrohexaazaisowurtzitane, more volatile than said nonsolvent, chosen from the group consisting of esters, nitriles, ketones and their mixtures), the production of said suspensions and their use to manufacture pyrotechnic objects. The use of said at least one hydrofluoroether as nonsolvent is particularly appropriate.