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|  MIL-S-20517H (AR)
4.5.2.2 Diametrical. The test method and the length of the
tubes shall be as specified in 4.5.2.1. 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 applicable drawing requirement.
4.5.3 Determination of ingredients. (See 4.5.1 for replicate
determinations and 6.7 for equivalent test methods).
4.5.3.1 Delay composition.
(Barium Chromate, Boron) - In lieu
of making an analysis of each batch of delay compositions, as
applicable, a batch record shall be prepared for each batch produced
for production use. This batch record shall be used to demonstrate
the actual amounts of each ingredient used to make the batch as
specified on the applicable drawing. In additon to recording
composition of the batch, the batch record shall also be used to
record any control curing time for mixtures as necessary prior to
loading. A batch of composition shall be the amount of composition
used during a single work shift by a single employee or crew. The
batch may contain one or more mixes. When more than one mix is used
in a batch, the exact proportion of ingredients shall be measured
into each mix.
(Black Powder, Aluminum Powder)
4.5.3.2 Flash powder.
4.5.3.2.1 procedure. Transfer an accurately weighed portion of
approximately 2 g. 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 milliliters (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 +
5C. 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 + 5C oven and then cool in a desiccator and weigh. Calculate
the percent of aluminum as follows:
Percent aluminum =
where:
A = weight of
crucible and contents after the carbon disulfide
and water
extraction, g.
B = weight of
crucible and contents after the acid extraction,
g.
w = weight of
the sample, g.
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