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Moisture content of black powder determination |
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|  MIL-I-60476A(MI)
4.4.7.1.2 Charge Composition. The full charge load from two (2)
Igniters will be accurately weighted and individually analyzed for
potassium nitrate composition according to MIL-P-223 Procedure 4.4.4.1.1
with the following modification: Extraction of the potassium nitrate will
0
be performed with hot (55-60 C) water and not brought to a boil as
described in MIL-P-223. (Bolling water must be avoided as it reacts
with the magnesium and leads to anomalous results.) Using the potassium
nitrate content of black powder obtained in 4.4.7.1.1, the total black
powder content of the igniter charge is then calculated. The magnesium
content of the charge shall be taken as the difference between black
powder content and total charge weight,
*
4.4.7.2 Charge Composition by Magnesium (alternate method).
*
4.4.7.2.1 Magnesium in Coated Magnesium. Determine the magnesium
content in the lot of coated magnesium used in the production of the
igntters being tested by the procedure described in 4.4.7.2.2 substituting
a 2 gram sample of coated magnesium for the igniter charge load.
*
4.4.7.2.2 Charge Composition (alternate method). The full charge load
from two (2) igniters shall be accurately weighed and individually analyzed
for magnesium by the following procedure.
Quantitatively transfer the full charge load from one
igniter to a 1 Iiter volumetric flask. Add 50 milliliters concentrated
hydrochloric acid, mix well and heat gently on a steam bath until all
the magnesium is in solution. Add 300 milliliters of distilled water,
mix, cool to room temperature, then dilute to 1 liter volume and mix well.
Filter the solution through paper discarding the first 25 milliliters
collecting about 100 milliliters. Transfer quantitatively by pipet
25.O milliliters of this solution to a 100 milliliters beaker, add
10 milliliters of pH 10 buffer (To 68 grams ammonium chloride add
570 milliliters concentrated ammonium hydroxide, then dilute to 1 liter
with distilled water), then add 5 drops of Eriochrome Black T (EBT)
indicator solution (dissolve 0.5 grams of EBT in 5 grams of hydroxylamine
hydrochloride, then add 100 milliliters of alcohol) mix well. Titrate
the mixture with standardized 0,1 N Ethylenediaminetetraaoetlc acid to
the calorimetric end point. Calculate the percent coated magnesium in
the igniter using the results of 4.4.7.2.1, above, for the percent
magnesium in coated magnesium.
The black powder content shall be taken as the difference
between the full charge and the amount of magnesium present.
*
4.4.8 Moisture content of black powder determination. Moisture
content shall be in accordance with the method described in MIL-P-223.
(The contractor may, with the approval of the Government Inspector, use
some of the same charge samples used for igniter charge composition test).
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