MIL-DTL-46225D
C = dry weight of sample
4.6.3 Bulk density.
4.6.3.1 Preparation of specimen.
4.6.3.1.1 Applicable to dry lead azide. Transfer a portion of approximately 4 g to a drying
dish. Place the dish and contents into an oven, maintained no higher than 70 degrees C, until it
reaches a constant weight. Then cool in a dessicator to room temperature.
4.6.3.1.2 Applicable to wet lead azide. Transfer a portion of approximately 4 g to a 50
mL beaker. Decant off the excess water and add 20 to 30 mL of 95% 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. Transfer the contents of the beaker into a
weighing dish. Place the dish and contents into an oven, maintained no higher than 70 degrees C,
until it reaches a constant weight. Then cool in a dessicator to room temperature.
4.6.3.2 Charge plate method.
4.6.3.2.1 Aluminum charge plate. The aluminum charge plate shall be 3 inches long and
2 inches wide with a thickness of 0.278 inch. A single frustrum-shaped cavity near the center of
the plate will have a volume of about 0.1467 mL. The cavity shall have a top diameter of 0.230
inch, a bottom diameter of 0.177 inch, and cut through the entire thickness of the plate.
4.6.3.2.2 Determine volume of charge plate cavity. Tare a weighing pan. Place charge
plate on a piece of glazed paper. Fill the cavity with mercury until level with the surface of the
charge plate. Remove charge plate, allowing the mercury to flow onto the glazed paper.
Transfer the mercury to the pan and weigh. Determine the volume (V) of the cavity by dividing
weight of the mercury used to fill the cavity by the density of mercury at the working
temperature.
4.6.3.2.3 Aluminum charge plate procedure. (see 6.8.6 for precaution) Tare a weighing
pan. * Place the aluminum charge plate on a piece of glazed paper. Use a plastic conductive
spoon to fill the cup. 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 lead azide remains on the plate.
Carefully lift the plate from the glazed paper, which will allow only the lead azide in the cavity
to transfer to the glazed paper. The sample on the paper is transferred to the weighing pan.
Repeat the process from the * until 5 samples are collected in the weighing pan. Weigh the pan
and calculate the bulk density with the following formula:
Bulk Density, g/mL = A/(5xV)
Where
A = weight of the 5 samples
V = the volume of the charge plate cavity
12
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business