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|  MIL-S-1398E(AR)
4.4.4 Inspection equipment. The inspection equipment required
to perform the examinations and test prescribed in this
specification is identified in the Examination (4.4.2) and Test
Method (4.5) paragraphs herein. See 6.3 for details concerning
responsibilities for inspection design and approval.
4.5 Methods of inspection.
4.5.1 Moisture content.
4.5.1.1 Star charge composition.
4.5.1.1.1 Preferred method. The Karl Fischer method as stated
in MIL-STD-1234, Method 101.2 up to paragraph 5.3 shall be used. A
sample of fifty (50) + 0.1 g shall be added to a 500 milliliter (mL)
volumetric flask containing approximately 300 to 400 mL of methanol
and 25 g of dry sodium nitrate. The flask shall be stoppered and
the contents swirled cautiously for several minutes until the
material is thoroughly dispersed. The sample shall be allowed to
--
remain in contact with the methanol for approximately two hours.
The the 500 mL of volumetric flash shall be filled up to the 500 mL
mark with methanol and swirled again. A blank without the sample
shall be put through the same procedure. After the sample has
settled, a 50 mL aliquot of the clear supernatant liquid shall be
withdrawn and, immediately 100 mL of methanol which has just been
titrated to the preliminary end point as described in MIL-STD-1234,
Method 101.2, paragraph 5.1. The final end point shall be reached
in 3.5 minutes in the manner described in MIL-STD-1234, Method
101.2, para. 5.4. A 50 mL aliquot of the blank shall be titrated in
the same manner. The water content shall be calculated as follows:
Percent water = (VR-S) - (V'R-S') X 100
where:
F = g of water per mL of standard water in methanol
solution.
V = mL of Karl Fischer reagent added to the sample.
V' = mL of Karl Fischer reagent added to the blank.
R = mL of standard water in methanol solution per mL of
Karl Fischer reagent.
S = mL of standard water in methanol solution for
titration of sample.
S' = mL of standard water in methanol solution for back
titration of blank.
w = weight of sample in g.
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