Breaching Technologies Lock Explosive Breaching Door User Manual
Page 10
Explosives
The BTI Explosive door is designed to function with “pushing type”
charges only. The use of shape and cutting type charges will only
damage the door and increase the risk for injury.
Based upon our experience, pushing charges of 250 to 350 grains of HE
are sufficient to open the door. The use of charges in excess of 350
grains equivalent will only lessen the life of the door and increase the
chance of injury.
Typical charges and methods utilized by BTI personnel are shown at the
right. This pushing charge consists of 5 1-foot wraps of 50-grain/foot-
detonation cord, resulting in a 250-grain charge. This charge is attached
to a ¼ thick piece of polyethylene, which in turn is attached to the face of
the explosive breaching door with normal double-sided carpet tape.
Other typical methods of backing material for the charges are rubber
conveyor belting and other plastic materials. Note that the chosen
backing materials become fragmented projectiles during the subsequent
explosion.