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|  MIL-S-10522K (PA)
where:
D = loss in weight of crucible and contents due to extraction
with 15N nitric acid.
F = factor obtained by subtracting the percent volubility
of the red phosphorus from 100 and expressing the
result as a decimal fraction
A = weight of sample.
4.5.2.1.3 Charcoal. - Percentage of charcoal in the sample
shall be calculated as follows:
where:
G = weight of crucible and charcoal.
C = weight of crucible.
A = weight of sample.
4.5.2.2 Scratcher composition. - A one gram sample shall
be selected from each batch of scratcher composition and analyzed
as specified in the following paragraphs.
4.5.2.2.1 Antimony sulfide. - An accurately weighed portion
of approximate ly one gram of the sample of scratcher composition
which has been previously dried at 100 plus or minus 5 degrees
C ., shall be transferred to a 150 ml. beaker. Fifty (50) ml.
of water shall be added to the beaker, the contents heated on
a steam bath for one hour, and filtered using a tared, medium
porosity sintered glass filtering crucible. The beaker and
residue shall be washed five times with hot water, and the
residue caught In the above mentioned crucible. The crucible"
and contents shall be dried for one hour at 100 to 105 degrees
C ., cooled In a desiccator and weighed. The filtrate shall be
retained for the determination of potassium chlorate and dextrin.
The gain in weight of the crucible shall be calculated to
percentage of antimony sulfide in the sample.
4.5.2.2.2 Potassium chlorate. - The filtrate obtained in
4.5.2.2.1 shall be diluted to 250 ml. in an accurately calibrated
volumetric flask. A 25 ml. aliquot shall be transferred with a
calibrated pipette to a 500 ml. Erlenmeyer flask, diluted to
approximately 150 ml. and approximately 50 ml. of 18N sulfuric
acid shall be added. The flask shall be stoppered with a rubber
stopper equipped with a Bunsen valve and the contents heated
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