Abstract: The present invention relates to gas-generating pyrotechnic compositions.The compositions according to the invention contain a small amount of epoxy binder, stabilized ammonium nitrate, optionally potassium perchlorate or an organic oxidant containing nitrogen and, characteristically, a reactive organic nitrogen compound selected from nitroguanidine, guanidinium nitrate and oxamide. This reactive nitrogen compound may advantageously be combined with cupric oxide. The compositions according to the invention produce nitrogen-rich gases with very low levels of nitrogen oxides, and find their preferred application in the form of pellets as pyrotechnic charges in gas generators for pyrotechnic extinguishers, for devices designed to inflate external structures or for devices designed to protect the occupants of a motor vehicle.

Abstract: An attachment for a heat shield is intended to protect the face of the cylinder head comprising one of the walls of the combustion chamber of the cylinder of an internal combustion engine in which the transfer of gases is controlled by valves having seats inserted into the cylinder head. The inserted seats of the valves are provided with an annular rim which, when the seat is fitted into a bore in the cylinder head, presses against the wall of the cylinder head the heat shield. Application is to insulating the inner walls of a heat engine cylinder head or to creating hot points in the combustion chamber of the cylinder head.