MIL-DTL-50523A
4.5.2 Specific gravity. This is a destructive test; samples cannot be returned to the lot.
The sample shall be selected randomly after the charges have been packaged in charge
containers. External temperature of the charges at time of test shall be 73 ± 3°F (22.8 ± 1.7°C).
Samples shall be temperature conditioned for a minimum of 24 hours prior to removal from
charge container. The specific gravity of each sample M112 charge shall be determined as
follows:
a. Remove each demolition charge from its charge container being careful not to damage
the charges.
b. Weigh the (dry) charge to the nearest .01 pound.
c. Weigh the charge immersed in water with water temperature at 77 +/- 9 degrees F (25 +/-
5 degrees C), taking care to remove all air bubbles remaining on the surfaces of the
charge.
_____Wei______charge ______
___ ght of ______ dry
x
Specific gravity of H20
Specific gravity =
(Weight of charge dry minus
weight of charge immersed in
water)
d. Failure of any one of the sample demolition charges to meet a minimum specific gravity
of 1.50 shall result in lot rejection.
4.5.3 Energy output test. Sample shall be randomly selected from each M112 lot after
the charges have been packaged in charge containers. External temperature of the charges at
time of test shall be 73 +/- 3 degrees F (22.8 +/- 1.7 degrees C). Samples shall be temperature
conditioned for a minimum of 24 hours prior to removal from charge container. The M112
demolition charge assembly shall be measured against a steel witness plate to verify
effectiveness of the explosive.
4.5.3.1 Effectiveness of explosive. The charge shall be cut from each M112 charge to the
dimensions of 0.5 x 1.5 x. 10.0 inches (nominal). Any charge that breaks during the sample
preparation will not be replaced. The breakage will be recorded as part of the test data. Charge
will not be considered defective if it can be kneaded/hand pressed into the required shape.
Failure of the charge to be kneaded/hand pressed into the required shape or failure to pass the
energy output test will result in lot rejection. The steel witness plate is an ASTM A36 steel with
dimensions of 1.0 x 10.0 x 10.0 inches (nominal). The charge shall be applied to the witness
plate and primed at the center using either M6 or M7 blasting cap on top of the charge. The
blasting cap end shall be covered with a strip of C-4 explosive approximately 0.5 x 1.0 x 4.0
inches. The primed area shall be secured with tape to ensure intimate contact between the charge
and the witness plate (see Figure 2). Failure of any one of the sample demolition charges to cut a
steel witness plate completely into two separate sections will result in lot rejection.
4.5.3.2 Witness plate setup. Each witness plate shall be placed on two (2) solid steel
supports with a 4 inch span between the supports as shown in Figure 2.
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