MIL-DTL-398D
4.7.8.2 Interferences. The following interferences apply to
both the ERL (4.7.8.3) and the Holston (4.7.8.4) 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.
4.7.8.3 ERL, type 12, 2.5 kg impact sensitivity method. The
impact sensitivity of RDX 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 RDX through a
sample splitter until a representative portion of approximately
10 gram is obtained. A small scoop will be used to measure the
RDX 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 RDX 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.
(b) Performance of the test. Test data shall be recorded on
a worksheet which can be on paper (hard copy) or on a computer.
Record sample name, ID number or lot number, sample preparation
(powder, cube, etc.), requester, operator, date, temperature, and
humidity. The drop heights used for the test are as follows:
64.0
cm
50.5
cm
40.5
cm
32.0
cm
25.5
cm
20.0
cm
16.0
cm
12.5
cm
18
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