MIL-DTL-398D
Lift the weight and raise the safety shield and allow the weight
to rest on the safety shield. Examine the percussion cap to
determine if an explosion has occurred. If an explosion has
occurred, the percussion cap is usually disintegrated. A partial
explosion may be recognized by inspection of the cap for parts of
the rim having been blown away. An explosion may also be
recognized by a sharp report or smoke in the area of the plunger,
Clean away all of the unexploded material and percussion cap
parts from the anvil, plunger and base plate with a brush or
cloth prior to placing the next test sample in place. Repeat the
procedure with the remaining RDX loaded percussion caps until
twenty trials have been recorded. Raise the electromagnet 5 cm
after each non-explosion and lowering the electromagnet 5 cm
after each explosion. The first non-explosion after an explosion
shall be considered as the starting point of the twenty trials.
Record the electromagnet height for this trial in cm as the first
of the twenty trials. Place a minus sign (-) opposite the height
in cm indicating the trial resulted in a non-explosion. Record
the electromagnet height for each subsequent trials and either a
minus sign to indicate a non-explosion or a plus sign (+) to
indicate an explosion.
Calculate the percentage explosions at a given height using
the following equation:
Explosions, 50% point = A x 100
B
Where:
A = The number of explosions at a given height.
B = The total number of explosions and non-explosions at the
given height.
Calculate the impact sensitivity as follows:
Impact sensitivity, cm = C - 5(D-50)
D-E
Where:
C = The lowest height
in cm at which more than 50% explosions
occurred
D = The percentage of
explosions greater than 50%
E = The percentage of
explosions less than 50%
5 = The difference in
height in cm of each test
The Holston impact machine shall be tested for accuracy each day
that it is used for testing RDX in accordance with the
specification. For this purpose an RDX sample having a known
sensitivity range shall be used. The test shall be run in
accordance with 4.7.8.4. The results shall be recorded on a
chart and fall within the minimum and maximum values for the
control sample (control limits).
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