18.104.22.168 Black Powder. - The moisture content of the black
powder shall be determined in accordance with MIL-P-223.
22.214.171.124 Alternate method. - The moisture content shall be
determined in accordance with Method 101.4 of MIL-STD-286.
The timer shall be set to the minimum time required to obtain
constant readings and the drying temperature shall be as
specified in 126.96.36.199.
4.5.2 Determination of compositions
188.8.131.52 Match head. - Prior to adding the lacquer, a
one gram sample shall be selected and analyzed as follows:
184.108.40.206.1 Antimony sulfide. - An accurately weighed
portion of approximately one gram shall be transferred to a
150 milliliter (ml.) beaker. Twenty-five (25) ml. of 12N
hydrochloric acid shall be added to the beaker, and heated
on a steam bath for 30 minutes with occasional stirring, and
then filtered into a tared medium porosity glass crucible with
suction. The beaker and contents of the crucible shall be
washed with a two-percent solution of hydrochloric acid and
finally with four 5 ml. portions of water.
The crucible and contents shall be dried in an oven maintained
at 100 plus or minus 5 degrees C. for one hour, cooled in a
desiccator for 1 hour and weighed. The residue shall be saved
for the red phosphorous determination (paragraph 220.127.116.11.2).
The percentage of antimony sulfide in the sample shall be
calculated as follows:
Percentage of antimony sulfide =
weight of sample
weight of glass crucible and residue.
weight of glass crucible.
loss In weight of crucible and contents after
extraction with 15N nitric acid as determined In
E = factor required by the volubility of red phosporus in
hydrochloric acid (see 18.104.22.168.2).
22.214.171.124.1.1 Calculation of factor E. - From the lot of
red phosphorus used in the manufacture of the match head