MIL-DTL-398D
The RDX samples which are prepared shall be tested using the
conditions and methodology outlined in 4.7.7.1 and 4.7.7.3. Use
the chromatographic peak area for HMX in the sample to determine
the HMX content and the subsequent RDX purity using the following
calculations:
Percent (HMX) = 100 x A x B
CxW
Where:
A = The HMX chromatographic peak area (or height) obtained
for the HMX in the RDX sample.
B = The weight of HMX in the calibration standard grams.
(Use the calibration standard which provided a peak area
closest to the area obtained for the sample.)
C = The HMX peak area obtained for the calibration standard
having the weight, B above.
W = The total weight of the RDX sample in grams.
Percent (RDX) = 100 - Percent (HMX)
In the development of a calibration curve using the three RDX/HMX
standards, upon establishing the linearity of the HPLC method
response across the concentration range being studied, a single-
point calibration using the standard which provided a peak area
for the HMX component closest to the area obtained for the sample
can be used to determine the HMX concentration in the RDX
product.
4.7.8 Impact sensitivity.
4.7.8.1 Safety. Proper safety should be exercised in
determining the impact sensitivity of RDX. Compliance with local
safety rules is required. The following safety precautions apply
to both the ERL (4.7.8.3) and the Holston (4.7.8.4) impact
sensitivity test methods.
Observe normal safety precautions -- pay particular attention
to the following rules:
a.
Operate the exhaust fan while tests are being performed.
b.
Always operate the machine with a safety shield in place.
c. Secure the weight with a safety chain while cleaning the
machine.
d. Remove waste explosives from the room after completion of
each test.
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