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|  MIL-D-70436(AR)
4.5.5 Composition of primer mixture. The composition of th
primer mixture shall be determined by performing the following
tests in the sequence specified.
4.5.5.1 Barium nitrate. An accurately weighed portion of
approximately 0.5 gram of primer mixture shall be transferred to
tared medium-porosity, fritted glass crucible of 20 ml capacity.
Three ml of lead azide saturated distilled water shall be added
a temperature of 50 degrees C plus or minus 2 degrees C, agitate
for one (1) minute, and, if necessary, lumps shall be broken up
with a rubber policman attached to a glass rod. Suction shall b
applied. This procedure shall be repeated five times, making a
total of six, 3-ml extractions. The sample in the filtering
crucible shall be rinsed three times with alcohol, dried in an
oven maintained at 60 degrees C plus or minus 5 degrees C for 30
minutes, cooled in a desiccator and weighted. The loss in weigh
shall be calculated as the percentage of barium nitrate in the
sample on a dry basis as follows:
where:
A = Weight of crucible and sample.
B = Weight of the crucible and sample after extractions with
lead azide saturated water.
M = Moisture content of sample obtained from 4.5.3 in percer
W = Weight of sample.
4.5.5.2 Lead styp hnate.
4.5.5.2.1 Basic lead styphnate (when applicable). The
residue obtained in the determination of barium nitrate shall be
extracted with six 5 ml portions of saturation ammonium acetate
solution at about 25 degrees C, (hot saturated ammonium acetate
shall not be used as it disolves antimony sulfide to some extent
agitating each portion for about 30 seconds and allowing each
portion to remain in contact with the residue for approximately
two minutes. The residue shall be washed with water until the
filtrate coming through the crucible appears colorless. Reserve
the crucible and residue for the tetracene determination. The
filtrate and washings shall be quantitatively transferred to a 2
ml calibrated volumetric flask, the beaker washed thoroughly wit
distilled water and diluted to the mark. Using a calibrated
pipette, a 2 ml aliquot of this solution shall be transferred to
50 ml calibrated volumetric flask and diluted to the mark with
distilled water. A portion of this solution shall be transferre
to acorex glass spectrophotometric cell having a width of 1
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