MIL-DTL-20517J (AR)
4.5.2 Determination of flash powder ingredients. (Black Powder, Aluminum
Powder) (see 4.5.1 for replicate determinations and 6.6 for equivalent test methods)
Transfer an accurately weighed portion of approximately 2 grams of the flash powder
that was dried for the moisture determination to a tared crucible. Wash the sample
between 10 and 15 times with 5 milliliter (mL) portions of cold carbon disulfide and rinse
with ether. Continue washing the sample with fifteen, 20 mL portions of cold distilled
water, allowing each wash of the water to remain in contact with the sample
approximately 1 minute before applying suction. Aspirate the crucible and contents
thoroughly, and dry in an oven maintained at a temperature of 100 + 5°C. The crucible
and contents shall be cooled in a desiccator and weighed. To the contents remaining in
the crucible add several portions of hot, dilute hydrochloric acid until the reaction
subsides. After all reaction has ceased, wash the residue with several portions of hot
water. Dry the crucible and contents in the 100 + 5°C oven and then cool in a desiccator
and weigh. Calculate the percent of aluminum as follows:
( A - B) 100
Percent aluminum =
W
where:
A = weight of crucible and contents after the carbon disulfide and
water extraction, in grams.
B = weight of crucible and contents after the acid extraction, in grams.
W = Weight of the sample, in grams.
Determine the percentage of black powder by subtracting the percentage of aluminum
from 100.0 percent.
When blending is accomplished in individual charge cases, the adequacy of the
composition may be determined by emptying one or more of the partially mixed charges
from the charge cases before they have been closed, blending the ingredients and
performing an analysis on the sample of the mixture.
4.5.3 Tube strength.
4.5.3.1. Axial. The tubes shall be tested in accordance with ASTM D 695 except
that the length of the tubes shall be in accordance with the length dimension on Drawing
8848484. The load shall be applied perpendicularly to the ends of the tube. Observation
shall be made for compliance with the requirement on drawing 8848484.
4.5.3.2 Diametrical. The test method and the length of the tubes shall be as
specified in 4.5.3.1. The load shall be applied by parallel flat plates in a direction
perpendicular to the axis of the tubes. Spherical seats are not required. Observation shall
be made for compliance with the requirement on drawing 8848484.
4.5.4 Fragmentation. The charge case assemblies shall be suspended by means of
a cord or thread at least one (1) meter from any solid object. They shall be functioned
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