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|  MIL-S-13175H(AR)
AMENDMENT 1.
2. Antimony Sulfide. To the crucible containing the
residue, obtained as indicated in Section 1, add six 15 ml.
portions of concentrated hydrochloric acid at approximately
80C. Maintain each portion of acid in contact with the
contents of the crucible for approximately three minutes using
a glass stirring rod for mixing. Aspirate after each addition
of acid. The disappearance of all dark material indicates
complete reaction of the antimony sulfide. Wash the contents
of the crucible with four 5 ml. portions of 2% hydrochloric
acid and finally with four 5 ml. portions of water, both at
room temperature. Aspirate thoroughly and place crucible,
with contents, in a drying oven maintained at 110 5C.
for a minimum of 60 minutes. Cool the crucible, and residue,
in a desiccator and obtain its weight.
% Antimony Sulfide = B-C X 100
w
Weight of residue and crucible, from Section 1.
Where: B =
Weight of residue and crucible after acid extraction
c=
w=
Weight of sample, from Section 1.
Polystyrene.
3.
% Polystyrene = 100 - (D+E)
D = % Potassium Chlorate
Where:
E = % Antimony Sulfide."
Preparing activity:
Custodian:
Army - AR
Army - AR
(Project 1370-A191)
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