Abstract: The invention relates to an ignition system comprising an igniter constituted by a receptacle, an ignition initiator disposed at one end of said receptacle, and a solid charge placed inside the receptacle, the solid charge comprising pyrotechnic compositions and reactive divided metals capable of reacting with one another exothermically, which compositions successively comprise, from the end of the receptacle carrying the initiator, a pyrotechnic ejection composition, a pyrotechnic ignition composition, and reactive divided metals respectively of decreasing activity, wherein the igniter is associated with a combustion chamber containing a fluid constituted by liquid products or formed by mixtures of gases and of liquids or of solid particles, to ensure, by projection of said solid charge within said fluid, the heating or ignition of said fluid.

Abstract: An igniter for a combustible powder block comprises a non combustible receptacle with an ignition initiator arranged at one end of the receptacle and a charge in the receptacle for thrusting on to the combustible parts of the block to produce ignition, the charge including a pyrotechnic ejection compound, a pyrotechnic ignition compound and reactive divided metals, the charge having decreasing activity successively from the end of the receptacle carrying the initiative.