Celluloid Protector

Figure 8-25. Blasting caps

Figure 8-24. Percussion primer

Firing devices are issued with this type of primer installed in the coupling base. The primer is also issued separately for repriming firing devices used with practice mines and boobytraps.

(5) Blasting caps. Commercial and Army blasting caps, electric and nonelectric, are used to initiate explosives (fig. 8-25). Army types consist of a thin, tubular, metallic shell about 21/2 inches long and 1/4-inch in diameter filled with small charges of sensitive high explosives. In priming, the caps are inserted directly into the cap wells of demolition explosives. The electric cap has wires for attachment to a blasting machine; the nonelectric cap may be crimped to any standard firing device. Nonelectric caps may also be crimped to safety fuse (time blasting fuse) fitted

Figure 8-25. Blasting caps with a fuse igniter, or crimped to detonating cord. Special Army caps, electric and nonelectric, loaded with pentaerythrite (PETN), are used to detonate the less sensitive military explosives, such as TNT and ammonium nitrate. Commercial caps may be used to detonate the more sensitive explosives, such as dynamite, gelatin dynamite or nitrostarch. For detailed information on blasting caps, see FM 5-250, TM 9-1375213-12 and TM 9-1375-213-34.

c. Miscellaneous Accessories and Tools.

(1) Priming adapter. The explosive priming adapter (fig. 8-26) is a small, hollow, plastic, hexagonal-head cylinder that is threaded on one end.

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