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Moisture content of primer mixture. |
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|  MIL-D-70603(AR)
portions of chloroform
until the lose in weight on subsequent
than 0.003 grams. The loss in weight of the
extractions total less
crucible plus contents
shall be calculated to percent calcium
resinate in the sample
on a moisture-free basis as follows:
Percentage of Calcium Resinate = 100A
w
Where:
A = loss in weight of the crucible plus contents.
w = weight of sample
4.5.2.2 Graphite. The crucible and contents remaining after
the removal of calcium resinate shall be washed with a minimum of
three 20 ml. portions of acetone, each portion maintained in contact
with the residue for approximately 1 minute with continuous stirring
before applying suction, until the subsequent test for RDX in the
acetone washings is negative. The crucible and contents shall be
washed with a minimum of 3 ml. portions of acetone, each portion
maintained in contact with the residue for approximately 1 minute
with continuous stirring before applying suction, until the
following qualitative test for RDX in the acetone washing is
negative . The acetone filtrate shall be transferred to a 25 ml.
beaker, evaporated to dryness on a steam bath and several drops of a
solution of chromotropic acid added in 36N sulfuric acid. The
formation of a reddish-brown color, as compared to a pink color
obtained by a blank prepared in an identical manner indicates the
presence of RDX. The residue shall be aspirated until the odor of
acetone is no longer detectable: the crucible and contents shall be
placed in a drying oven at 95-105C for 1/2 hour, cooled in a
desiccator and weighed. The weight of the residue in the crucible
shall be calculated to the percentage of graphite in the sample on a
moisture free basis as follows:
Percentage of Graphite = 100A
w
Where:
A = increase in weight of filtering crucible.
w = weight of sample.
4.5.2.3 Total binder-lubricant. The percentage of total
binder-lubricant in the sample shall be calculated by adding the
percentage of calcium resinate and graphite found.
4.5.3 Moisture content of primer mixture. The moisture content
of the primer mixture shall be determined in accordance with
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