MIL-DTL-14970D
4.5.4 Product testing. Unless otherwise specified, the
samples obtained in 4.5.3 shall be subjected to the tests
listed in 4.5.2.1. Unless otherwise specified in the
contract (see 6.2) the results of the tests shall be
reported in accordance with MIL-STD-1171. (See 6.11)
4.5.5 Inspection equipment. For the performance of all
tests and examinations specified in 4.5 and 4.6, commercial
inspection equipment should be employed. The contractor
shall have available, and utilize correctly, this equipment
and is charged with the responsibility of assuring that
proper calibration procedures are followed. Government
approval of all inspection equipment is required prior to
its use for acceptance purposes (see 6.7).
4.6 Methods of inspection. The following tests shall
be performed using prescribed analytical procedures for
replicate determinations given in standard analytical
textbooks or ASTM D2905 method. Also, unless otherwise
specified herein, all chemicals and reagents shall be ACS or
reagent grade. The density/sensitivity test (4.6.7) shall
not be run in duplicate. (See 6.6 for the use of equivalent
test methods.)
4.6.1
Composition.
4.6.1.1 Stearic acid content. Place an approximately 5
g portion weighed to the nearest 0.1 mg of the dried sample
in a tared, clean, dry, medium porosity filtering crucible
containing a filter pad. Place the crucible containing the
sample into a stainless steel pan. Add 20 ml of aliphatic
naptha saturated with RDX into the crucible and allow the
solvent to remain in contact with the explosive, at room
temperature, for approximately 5 minutes. Stir the contents
of the crucible to break up lumps and to aid in extraction
of the sample. Perform all extractions and dispensing of
naptha under a fume hood. Remove the crucible from the pan
and place it on a vacuum source to filter off the solvent.
Repeat the addition of 20 ml of naptha, extraction for 5
minutes with occasional stirring and filtering, two
additional times. Wash the interior of the crucible with
approximately 20 ml of naptha from a wash bottle. Aspirate
the residue until the naptha solvent is no longer detectable
(approx. 2 minutes). Dry the crucible and residue in a
drying oven at 90oC to 105oC for approximately 30 minutes.
Remove the crucible and residue from the oven and allow it
to cool to room temperature in a desiccator and weigh to the
nearest 0.0002 g. Calculate the percent of stearic acid on
a moisture free basis as follows:
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