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|  MIL-L-14758 (MU)
4.3.7.1.2 Applicable to wet lead azide.-Transfer a portion
of approximately 4 gm to a 50 ml beaker. Decant off the excess
water and add 20 to 30 ml. of 95 percent ethyl alcohol.
Gently swirl the beaker and contents for a few minutes and then
decant off the alcohol. Repeat the procedure of adding alcohol,
swirling and decanting once more. Then add 20 to 30 ml. of
anhydrous ethyl and swirl the beaker and contents for a
few minutes. Allow the lead azide to settle and decant the
ether off. Air dry the sample until no ether odor is detected.
Place the beaker and contents in a steam oven, maintained at
65 degrees plus or minus 5 degrees C., for 1 hour, and then cool
in a desiccator to room temperature.
4.3.7.2 Aluminum charge plate.-The aluminum charge plate
shall be 3 inches long, 2 inches wide with a single cavity near
the center which has a volume of about 0.1467 ml. The cavity
shall be a frustrum with a top diameter of 0.230 inch, a bottom
diameter of 0.177 inch and a height of 0.278 inch. Determine
the volume of the cavity by dividing the mercury used to fill
the cavity by the denisty of mercury at the working temperature.
4.3.7.3 Procedure.-CAUTION: Perform this test behind a
properly barricaded and grounded area and limit the quantity of
lead azide in the area to that which is only going to be tested.
Place the aluminum charge plate on a piece of glazed paper and
fill the cavity with lead azide by means of a plastic dipper.
Level off the excess lead azide, with the aid of a cardboard
spatula, so that it is even with the surface of the plate.
Take care that the excess azide remains on the plate thereby
allowing none of the sample to fall onto the piece of glazed
paper. Lift the plate from the glazed paper, which effects
a transferal of the lead azide to the glazed paper. Transfer
this specimen to a tared weighing pan. Repeat the above
procedure until five charges are collected in the weighing pan.
Weigh the pan and determine the bulk density by the following
formula:
=
Bulk density, gm./ml.
A
B
where:
A = weight of the 5 charges
B = five times the volume of the charge plate cavity
5.
PREPARATION FOR DELIVERY
5.1 Preservation and packaging - Level C.- Discharge the
wet washed azide from the kettle into a duck cloth bag (4 ounces
or heavier) or into a diaper cloth approximately 30 inches square.
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