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|  MIL-S-10521K (AR)
4.5.2.1.1.2 In the course of analysis of samples of match head
composition, the volubility in hydrochloric acid of red phosphorus
shall be recorded whenever practicable.
4.5.2.1.2 Red phosphorus. The residue obtained in 4.5.2.1.1
shall be transferred from the glass crucible to a 150 ml. glass
beaker with the aid of a stirring rod and five 5-ml. portions of 15N
nitric acid. The crucible shall be rinsed with four 5-ml. portions
of distilled water, and the rinsing caught in the beaker. The
contents of the beaker shall be heated on a steam bath for one hour,
and filtered with the aid of the previously used crucible using
suction. The beaker and contents shall be washed with four 5-ml.
portions of distilled water. The crucible and residue shall be
dried in an oven maintained at 100 5C, 212 10F, for one
hour, cooled in a desiccator for 15 minutes, and weighed. The
percentage of red phosphorus in the sample shall be calculated as
follows:
P e r c e n t a g e of red phosphorus = 100D divided by F A
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 results as a
decimal fraction (see 4.5.2.1.1.1).
A = weight of sample.
4.5.2.1.3 Charcoal. percentage of charcoal in the sample shall
be calculated as follows:
Percentage of charcoal = G-C divided by A x 100
where:
G = weight of crucible and charcoal.
c = weight of crucible
A = weight of sample.
composition. The following analysis shall be
4.5.2.2 Scratcher
performed prior to adding the water to the composition.
4.5.2.3 Antimony sulfide. An accurately weighed portion of
approximately one gm of the sample which had been previously dried
at 100 5C, 212 10F 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 then filtered
using a tared, Gooch crucible. The beaker and residue shall be
washed five (5) 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 105C, 212 to 222F 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.
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