Abstract: A pyrotechnical composition for delay elements comprising metallic antimony and potassium permanganate are disclosed. The pyrotechnical composition can contain 0.1 to 2.08 percent of a light metal in powder form. It is useful as a delay composition in time fuses having burning time intervals of over 150 milliseconds.

Abstract: An instantaneous detonator has a detonator casing containing a primary charge and a secondary charge with fuze wires extending from outside the casing to an electrically actuated ignitor system located in the casing. An insert member is positioned in the detonator casing. This member has a continuous axial bore extending therethrough and includes a cross-sectional constriction. The bore is formed on one side of the constriction as a charge chamber that contains the primary charge and that faces the secondary charge and is formed, on the other side of the constriction, as a charge-free vacant chamber that faces the ignitor system. The insert member has a thick-wall section at least in that portion laterally surrounding the charge chamber, and the constriction has a configuration for preventing ignition of the primary charge by pressure forces exerted by air in the detonator casing compressed by detonation of an explosive acting on the exterior of the detonator casing.