MIL-DTL-45444C
Calculate the acetone insoluble material as follows:
Percent acetone insoluble material = (A-B) x 100
W
Where:
A = The
final weights of the acetone insoluble material
and
the crucible in grams.
B = The
tare weight of the crucible in grams.
W = The
HMX sample weight in grams.
4.7.5 Inorganic insoluble material. Ignite the sample
reserved from the acetone insoluble material determination,
4.7.4, in a muffle furnace at 700 + 10 degrees C for 30 + 5
minutes, cool in a desiccator and weigh to the nearest 0.1
milligram.
Calculate the inorganic insoluble material as follows;
Percent inorganic insoluble material = (C-B) x 100
W
Where:
C = The weight of the crucible and contents after
ignition in g.
B and W are as given in 4.7.4.
4.7.6 Acidity. Weigh an approximate 10 gram portion of the
dried sample accurately to the nearest 0.01 gram, place in a
clean 800 ml beaker and add 500 ml of acetone. Place the beaker
on a steam bath and heat with occasional stirring until the
sample has completely dissolved. One hundred ml of distilled
water shall be added and the mixture shall be cooled and titrated
with 0.05 normal (N) sodium hydroxide using phenolphthalein or
methyl red indicator. A blank shall be run and the results of
the titration of the specimen shall be corrected for acidity of
reagents. The acidity shall be calculated on the dry basis to
percent acetic acid as follows:
Percent acid (as acetic acid) = 6.0 (S-B) N
W
Where:
S = ml of sodium hydroxide solution used in sample.
B = ml of sodium hydroxide solution used in blank.
N = normality of sodium hydroxide solution.
W = weight of specimen on a dry basis, in grams.
4.7.7
Impact sensitivity.
4.7.7.1 Safety. Proper safety should be exercised in
determining the impact sensitivity of HMX. Compliance with local
safety rules is required. The following safety precautions apply
to both the ERL (4.7.7.3) and the Holston (4.7.7.4) impact
sensitivity test methods.
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