MIL-PRF-46676B (AR)
voltage of 3000 to 4000 volts and capacitance that with the voltage will produce a 4.0 joule
spark. The needle shall be rapidly depressed into the sample. Twenty samples shall be selected
for this test. Any flame or explosion shall be cause for rejection.
4.3.7 Bullet impact sensitivity. Ten rounds of 7.62mm M80 ball cartridge or commercial
.308 equivalent shall be fired from a gun perpendicular to the target at 40 feet. The target shall
consist of a flexible sheet if explosive ¼ inch by 3 inches by 3 inches sandwiched between a 1/16
inch thick mild steel front plate and 1 inch mild steel back-up plate. If any of the bullets cause
the specimen to explode the lot shall be rejected.
4.3.8 Bar drop impact sensitivity. Ten specimens with length and width of 1 inch and
0.050 ± 0.010 inches in thickness shall be selected for this test. A 10 pound steel bar with a
diameter of ½ inch at the striking face shall be dropped from a height of 15 feet into a piece of
flexible explosive placed on a steel anvil. If any specimen tested is accompanied by an explosion
or burning, the lot shall be rejected.
4.3.9 Flame Sensitivity. One specimen ¼ by ½ by 3 inches shall be placed into sawdust
soaked with kerosene and ignited. If a specimen explodes the lot shall be rejected.
4.3.10 Density. Three specimens shall be weighed to the nearest milligram and
measured with a suitable instrument to determine the volume. The density shall be calculated by
the formula below.
Mass
Density =
Volume
If the average of the three tests fails to comply with the requirement, the lot shall be rejected.
4.3.11 Exudation. The sheet shall be ¼ inch thick and cut to a 1 ½ inch square and then
placed on 15 layers of Watman No. 1 filter paper cut in 2 inch diameter circles with a porous
release paper placed between the explosive and the layers of filter paper. A 125-gram brass
weight 1 ½ inch square shall be placed on top of the sample. This assembled sample shall then be
placed on a wire screen and stored in a forced draft oven for 24 hours at 160°F. Before
assembly, the brass weight shall be weighed. The initial weight of the filter paper shall also be
recorded. After hot storage, the sample and brass weight shall be removed from the filter paper
while still warm. The sample and brass weight shall be cooled while in an upside down position.
When cool the sample and brass weight shall be weighed together. The filter paper shall be
weighed separately. Report both weight loss from the sample, if any, and weight gained on the
filter paper, if any. In order to avoid an incorrect result due to volatile loss, exudation from the
explosive sample shall be computed based only on the weight gained on the filter paper. The
exudation of flexible explosive shall be calculated as follows:
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