MIL-DTL-45444C
Observe normal safety precautions -- pay particular
attention to the following rules:
a.
Operate the exhaust fan while tests are being performed.
b.
Always operate the machine with a safety shield in
place.
c. Secure the weight with a safety chain while cleaning the
machine.
d. Remove waste explosives from the room after completion
of each test.
4.7.7.2 Interferences. The following interferences apply
to both the ERL (4.7.7.3) and the Holston (4.7.7.4) impact
sensitivity test methods.
a. A machine loosely assembled or not in proper alignment
may produce incorrect values.
b. A rough surface or cracks on the anvil or plunger may
produce lower sensitivity values.
c. Insufficient or unevenly distributed sample may produce
incorrect values.
d. A sample containing glass, metal or other gritty matter
foreign to the product may produce low sensitivity values. (A
low sensitivity value indicates more sensitive material.)
e. Wet samples or samples containing oil, greases and soft
plastics may produce high sensitivity values.
4.7.7.3 ERL, Type 12, 2.5 kg impact sensitivity method.
The impact sensitivity of HMX shall be determined using the ERL
type 12 impact machine with a 2.5 kg drop weight on a 35 mg
sample.
The following ERL test method is described in MIL-STD-1751:
(a) Sample preparation. Pass a dry sample of HMX through a
sample splitter until a representative portion of approximately
10 gram is obtained. A small scoop will be used to measure the
HMX powder sample. Weigh a few scoops on a balance to determine
the volume necessary to obtain 35 mg. Subsequent 35 mg samples
shall be measured on a volume basis using the small scoop. The
sample shall be poured directly onto a 180A garnet sand paper
(1" x 1" square) with the sand side up resting on a flat surface.
Approximately 25 samples of 35 mg HMX each on a one inch square
sand paper shall be prepared.
Each of the samples shall be
weighed on the garnet paper, (any abnormally high or low weight
should be adjusted), and placed on the anvil for testing.
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