Figure 4-8. Military nonelectric blasting cap

TM 9-1300-277

characteristics. Electric blasting cap M6 is replacing

demolition charge. The caps require only a small spit of

electric blasting cap J-2. The M6 caps are packed 6

flame or a shock on their igniter charge (within the cup)

caps per carton, 1 carton per waterproof bag, 25 bags

for ignition. A time blasting fuse or the primer in a firing

per fiberboard container, 6 containers (900 caps) per

device coupling base may provide the flame; the shock

waterproof lined wooden box (114 lb gross).

may be provided by a detonating cord which is initiated

by another cap.

(3) Caps, blasting, nonelectric, (fig. 4-8).

Nonelectric blasting caps initiate any standard

Figure 4-8. Military nonelectric blasting cap.

(4) Cap, blasting, nonelectric, M7.

The

(2) Safety fuse (fig.

4-9). Safety fuse

standard Army nonelectric blasting cap is the M7,

consists of black powder tightly wrapped with several

replacing the older commercial J1, No. 6 and No. 8.

layers of fiber and waterproofing material and may be

The open end of the M7's cup is flared to make insertion

any color, orange being the most common. The burning

of a fuse or coupling base nipple easier. The caps are

rate may vary for the same or different rolls from 30 to

packed 6 caps per carton, 1 carton per waterproof bag,

45 seconds per foot under different atmospheric and

50 bags per fiberboard container, 12 containers (3,600

climatic conditions (exposure for over 12 hours to the

caps) per wooden box.

elements, extreme changes in temperature, and the

like), and each roll must be tested prior to using in the

c. Blasting Fuse

area where the charge is to be placed. Particular

(1) Time blasting fuse. Time blasting fuse

precautions must be taken if used under water, as the

transmits a flame from a match or igniter to a

rate of burning is increased significantly. In artic

nonelectric blasting cap or other explosive charge

temperatures, the outside covering becomes brittle and

providing a time delay wherein blasters may retire to a

cracks easily.

safe distance prior to the explosion. There are two

(3) Time fuse M700 (fig. 4-10).

types: safety fuse and time fuse M700. These may be

used interchangeably.

Change 1

4-10