A process for obtaining a solid form containing heat-stabilized borazane, said solid form being capable of generating hydrogen by thermal decomposition or by a self-sustaining combustion reaction, said process comprising: a) making available at least one solid form of borazane chosen from grains of pulverulent powder, granules, pellets, blocks, and mixtures thereof, b) heat treating said at least one solid form of borazane, in air, at a temperature of between 50 and 85°C during at least two hours, the heat treatment generating an oxidized layer at its surface; said at least one heat-treated solid form of borazane then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by thermal decomposition; and c1) recovering said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by thermal decomposition; or c2) mixing said at least one solid form of borazane, chosen from grains of pulverulent powder and/or granules, heat-treated, with at least one inorganic oxidizing agent, which is in the form of a pulverulent powder and/or of granules; the resulting mixture, containing said at least one heat-treated solid form of borazane and said at least one inorganic oxidizing agent, then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction, and recovering said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction; or c3) mixing said at least one solid form of borazane, chosen from grains of pulverulent powder and/or granules, heat-treated, with at least one inorganic oxidizing agent, which is in the form of a pulverulent powder and/or of granules, followed by forming the resulting mixture to obtain pellets and/or blocks containing said at least one heat-treated solid form of borazane and said at least one oxidizing agent; said formed mixture containing said at least one heat-treated solid form of borazane and said at least one inorganic oxidizing agent then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction, and the recovery of said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction. a) making available at least one solid form of borazane chosen from grains of pulverulent powder, granules, pellets, blocks, and mixtures thereof, b) heat treating said at least one solid form of borazane, in air, at a temperature of between 50 and 85°C during at least two hours, the heat treatment generating an oxidized layer at its surface; said at least one heat-treated solid form of borazane then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by thermal decomposition; and c1) recovering said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by thermal decomposition; or c2) mixing said at least one solid form of borazane, chosen from grains of pulverulent powder and/or granules, heat-treated, with at least one inorganic oxidizing agent, which is in the form of a pulverulent powder and/or of granules; the resulting mixture, containing said at least one heat-treated solid form of borazane and said at least one inorganic oxidizing agent, then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction, and recovering said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction; or c3) mixing said at least one solid form of borazane, chosen from grains of pulverulent powder and/or granules, heat-treated, with at least one inorganic oxidizing agent, which is in the form of a pulverulent powder and/or of granules, followed by forming the resulting mixture to obtain pellets and/or blocks containing said at least one heat-treated solid form of borazane and said at least one oxidizing agent; said formed mixture containing said at least one heat-treated solid form of borazane and said at least one inorganic oxidizing agent then constituting a solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction, and the recovery of said at least one solid form containing heat-stabilized borazane, which is capable of generating hydrogen by a self-sustaining combustion reaction.