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Page Title:
Uncured PBXN-109 analytical procedure |
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|  MIL-E-82886(OS)
subside. Add approximately 5 mL of hydrochloric acid to the beaker. Place the beaker on a
hot plate and warm it gently on low heat. Additional 6N hydrochloric acid may be added and
the reaction allowed to continue until all the aluminum has been digested. The specimen may
also be mashed using a glass stirring rod to help speed up aluminum digestion. Transfer the
specimen to the same crucible described in 4.6.5.2a above, and filter the acid. Rinse the
resulting polymer at least 10 times with 10 mL of distilled water. Finally, wash the sides of
the crucible and polymer with 10 mL of acetone.
h.
Dry the crucible plus residue at approximately 100C for about 1 hour. Cool the crucible plus
residue to room temperature. Weigh the crucible, glass stirring rod, plus residue. Calculate
the percent aluminum as follows:
Ć
Ε
⋅ 100
Περχεντ αλ ινυ
υ
Χ
where:
E = Weight of crucible plus residue and glass stirring rod after acid extraction, (g)
i.
The remaining residue in the crucible is the polymer. Calculate the percent polymer as
follows:
Ε
Φ
Περχεντ šολ ερ
ψ
⋅ 100
Χ
where:
F = Weight of crucible and glass stirring rod, (g)
j.
Calculate the total percent binder as follows:
Περχεντ βινδερ
šερχεντ ν ηεšτανε εξτραχταβλ σ
ε
šερχεντ šολ ερ
ψ
4.6.5.3 Uncured PBXN-109 analytical procedure. Analyze, in duplicate, each sample of PBXN-
109 received for analysis. This shall consist of a sample from the top and a sample from the bottom of the
batch.
a.
Accurately weigh on an analytical balance to the nearest 0.1 mg an approximate 2-g sample of
the uncured explosive into a tared, 30-mL fine porosity, sintered glass filtering crucible.
Include the glass stirring rod in the tare weight of the crucible.
b.
Extract at ambient temperature using a vacuum filtrator with 5 portions, 10 mL each, of the
methylene chloride saturated with RDX. The extractions should have a stirring time of 1
minute each with the vacuum off while stirring.
12
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