MIL-DTL-18714F (OS)
4.6 Methods of inspection.
4.6.1 Radiographic. The primer shall be subjected to a radiographic inspection in accordance with ASTM
E1742. The primer shall be mounted in a vertical position and radiographically inspected perpendicular to its
axis, focused at a point 0.6 ± 0.2 inch from the stock face. During first article inspection or lot acceptance
inspection, any primer that appears to have been misassembled shall be subjected to detail strip and shall meet
the requirements of 3.5.
4.6.2 Determination of moisture content. Moisture analysis procedure for the black powder shall be as
follows:
a.
10 grams of black powder from each sample primer shall be tested in the granular form for moisture
content.
b.
The black powder shall be removed from the primer tubes and placed in a dry container with a tight
cover. Black powder shall not be exposed to the atmosphere for more than 3 minutes.
c.
Sample containers must be covered and placed in a desiccator until ready to test the moisture content.
d. Carefully weigh 2.0 ± 0.1 g of sample into a tared weighing dish or container. The sample shall be
weighed to the nearest 0.1 mg. Black powder shall not be exposed to the atmosphere for more than
3 minutes.
Uncovered samples shall then be placed in an oven at 70 to 75C. Do not draw vacuum.
e.
f.
After 4 hours minimum (4 ½ hours maximum), remove samples from oven, cover, and place in a
desiccator to cool. After cooling, carefully weigh samples to the nearest 0.1 mg. Calculate the
percent moisture as follows:
E
x 100
Percent moisture =
C
Where
C=A-B
E=AD
and
A = Sample weight plus container weight, un-dried, g
B = Un-dried container weight, g
C = Un-dried sample weight, g
D = Sample weight plus container weight, after drying, g
E = Weight difference, after drying, g
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