Abstract: The invention concerns a protective varnish applied to a caseless or combible-case round of ammunition against thermoinitiation. This varnish includes at least one reactive layer applied to the ammunition, consisting of a synthetic resin and an oxidizer with a decomposition temperature above 350.degree. C., and at least one insulating layer applied to the reactive layer consisting of a synthetic resin and a heat insulating compound. The resins are of the polyurethane, alkyd or oleophenolic type and the oxidizer is selected from the group constituted by potassium perchlorate, lead or barium chromate according to a percentage by mass varying from 1 to 20%. The insulating compound is represented by organic or mineral microballoons. The varnish may include an inner resin layer interposed between the ammunition and the reactive layer, an an outer resin layer applied to the insulating layer. Application to the rounds of ammunition of any caliber.

Abstract: The invention pertains to a smoke-producing pyrotechnical composition which is designed for the production of a smoke screen that prohibits the transmission of infrared radiance from a target to a pick-up.It includes a compound which generates, through thermal decomposing, carbon particles of which the size is included between about 1 and 14 .mu.m, and an oxidoreducing system which reacts at a temperature that exceeds 1000 degrees C. and a binding agent. The compound which generates carbon particles can be hexachloroethane, hexachlorobenzene, naphtalene, anthracene, or their mixture; the reducing agent can be a metal powder (magnesium) and the oxidizer hexachlorobenzene and/or hexachloroethane.An application to the execution of smoke-producing devices.

Abstract: The invention concerns a method and a smoke-producing pyrotechnical ammunition to shield the visible and infrared radiance in a wave length included between 0.4 and 14 .mu.m emitted by a target. First we produce instantly a first hot aerosol with a fast pyrotechnical composition, which masks the target through diffusion in the visible spectrum and with its emitting potential in the infrared zone. Then, we produce a second aerosol which contains hot carbon particles of which the size is included between 1 and 14 .mu.m with a slow pyrotechnical composition for shielding mainly through diffraction the thermal image emitted by the target. The fast composition includes zinc and zinc oxide, potassium perchlorate, hexachlorobenzene or hexachloroethane powder and a binding agent. The slow composition includes a compound which generates carbon particles of 1 to 14 .mu.