(1) The high strength initiators are the M11, M14,
(4) The low strength relay-type cap assemblies
M15, M16, M18, M19, M21 and M23 (caps), and M151
are the M12 and M13 which come with factory-attached
and M152 (boosters). All are nonelectric types and five
lengths of shock tube (500 feet for the M12 and 1000 feet
come with a length of special plastic tubing attached.
for the M13). The detonators of the relay-type caps are
This tubing is shock tube and its function is to transfer a
purposely made larger than standard military blasting
small initiating impulse to the detonating end of the cap
caps so they will NOT fit in standard capwells. These
(an explosive-filled aluminum tube or detonator) which
two caps are being phased out and replaced by the 500
produces a detonation shock wave strong enough to ini-
foot M21 and the 1000 foot M23.
tiate military explosives. The M11 blasting cap assem-
bly comes with a 30-foot length of shock tube factory-
attached to a standard size aluminum blasting cap. The
M11 is essentially instantaneous in its action. The M11
has a plastic connector on the free end of its shock tube.
All of the low strength shock tube type
The M16 is a 10-foot version of the M11.
blasting caps come with a special plastic
holder attached to the detonator to facilitate
(2) The M14 and M18 consist of military strength
quick and easy attachment to other blasting
and size nonelectric blasting cap, factory crimped and
calibrated (5-minute and 20 minute respectively) length
of M700 Time Blasting Fuse. It is a standardized delay
Flame may be produced when initiated min-
initiator for shock tube blasting cap priming systems.
itube is not fully unspooled. If the flame
The M15 has pyrotechnic devices installed to provide a
can compromise the Users position or cre-
small time delay between its initiation and firing of its
ate a fire hazard, the M19/M21/M23 items
two detonator(s). One detonator is low strength with a
should be fully unspooled prior to function-
25-millisecond delay and the other is high strength with
ing. The flame usually extinguishes itself.
a 200-millisecond delay. The low strength end of the
The flame has no effect on the performance
M15 and low strength shock tube type blasting caps
of the MDI items.
(M12, M13, M21 and M23) are meant to be used in re-
laying the initiating impulse to other shock tube or deto-
nating cord components. The M21 and M23 are
(5) A special Blasting Cap Holder, M9, will allow
replacements for M12 and M13 which are being phased
connection of up to five MDI components to a high
strength M11, M14, M16, M18, M19, M21 or M23 cap
assemblies, and M151 or M152 booster assemblies.
(3) The M151 assembly is a 10 foot detonating
cord with a booster attached. The M152 assembly is
(6) A Time Blasting Fuse Igniter, M81 will ini-
identical to the M151 except that it has a 30 foot detonat-
tiate the shock tube ends of the new blasting cap assem-
ing cord. The M151 and M152 can be used in place of
blies. The M81 is almost identical to the older M60
the M11 and M16. The M151 and M152 are used for
Igniter with the exception being that the M81 accommo-
priming charges in situations where simultaneous initia-
dates either the shock tube or standard diameter Time
tion and detonation are desired. The use of a booster as
Blasting Fuse, M700. The shipping plug in the M81 is
opposed to a blasting cap allows pre-priming and prim-
different from that of the M60 so that the items my be dif-
ing of a buried explosive charge.
ferentiated by touch as well as color. A two-piece ship-
distinctive configuration makes the M81 easily recogniz-
able from the M60 by both look and feel. The larger plug
When using the M12 and M13, unused por-
is of a softer plastic than the smaller. This allows secur-
tions will NOT be retained for reuse. To
ing of both plugs by the end cap to keep the item sealed.
avoid problems of disposal of unexpended
Shock tube is accommodated by loosening the end cap
shock tube, the pigtail should be used, ex-
and removing just the smaller plug. Tightening the end
pending the entire length of shock tube at
cap secures the shock tube. When both plugs are re-
moved, time blasting fuse is accommodated and secured.
The M60 Igniter will neither physically secure shock
tube nor reliably initiate it.