Abstract: A percussion initiatable explosive assembly with means for thermal actuation of same, comprising an explosive cartridge shell with main explosive charge contained therein, and a percussion initiatable primer extending into the main charge in detonating relationship therewith; a thermostatic member including a laminate of a pair of metallic layers having different coefficients of thermal expansion shaped as a curved strip having opposed convex and concave surfaces, with the concave surface facing the percussion sensitive portion of the primer; a pin secured to the curved strip and extending from the concave surface into spaced apart relationship with the percussion sensitive portion of the primer; and the strip member in response to a temperature increase adapted to thermally expand to change the curvature of said convex and concave surfaces respectively toward concave and convex so as to move the pin into impact relationship with the percussion sensitive portion of the primer to cause percussion ignition of s