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Page Title:
Alternate cured PBXN-109 analytical procedure |
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|  MIL-E-82886(OS)
4.6.5.2 Alternate cured PBXN-109 analytical procedure. Analyze one top and one bottom
specimen in duplicate. Cut the specimen into pieces measuring approximately 2 mm.
a.
Weigh an approximate 0.5000-g specimen to the nearest 0.1 mg into a tared, medium porosity
crucible with a glass stirring rod.
b.
Extract the heptane-soluble materials using three 10 mL portions (approximate volumes) of n-
heptane. Allow the n-heptane to soak for a few minutes, and mash the specimen using the
glass stirring rod prior to filtering.
c.
Dry the crucible plus residue at approximately 100C until no n-heptane fumes remain. Cool
the crucible plus residue to room temperature. Weigh the crucible, glass stirring rod, plus
residue.
d.
Calculate the percent n-heptane extractables as follows:
Α
Β
⋅ 100
Περχεντ ν ηεšτανε εξτραχταβλ σ
ε
Χ
where:
A = Weight of crucible plus specimen and glass stirring rod, (g)
B = Weight of crucible plus residue and glass stirring rod after n-heptane extraction, (g)
C = Weight of specimen, (g)
e.
Transfer the residue to a 100-mL or 150-mL beaker, and add approximately 20 mL of acetone.
To extract the RDX, carefully boil the specimen and mash the pieces using a glass stirring rod.
Filter the solution through the same crucible described in 4.6.5.2a above. Repeat the acetone
extraction three times using approximately 20 mL of acetone each time.
f.
Dry the crucible plus residue at approximately 100C until no acetone fumes remain. Cool the
crucible plus residue to room temperature. Weigh the crucible, glass stirring rod, plus residue.
Calculate the percent RDX as follows:
Β
Ć
⋅ 100
Περχεντ ΡĆ Ξ
Χ
where:
D = Weight of crucible plus residue and glass stirring rod after acetone extraction, (g)
g.
Transfer the residue contained in the crucible to a 30-mL beaker. Add approximately 1 mL of
6N hydrochloric acid to the residue. Wait for the initial reaction with aluminum to begin and
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