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Page Title:
Determination of cured resin and RDX/HMX |
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|  MIL-DTL-60426B(AR)
W/AMENDMENT 1
k. Unclamp funnel from funnel support.
l. With wash bottle rinse edges of PPE filter into graduated
cylinder.
m. Turn off vacuum by releasing valve on filtering bell.
n. Use forceps to transfer PPE filter to the aluminum dish.
Place PPE/aluminum dish in a 100 degree C drying oven for
one half hour.
o. Cool PPE/aluminum dish for 20 minutes before weighing.
p. Determine percentage of RDX/HMX with Resin:
%RDX/HMX and Resin =100 (A-B)
Weight of Sample
A=PPE filter, aluminum dish and filtrate after drying.
B= PPE filter and aluminum dish.
q. UV Analysis of TNT Procedure:
r. Warm up UV spectrophotometer, and measure
absorbance at 374 nm.
s. For a programmable UV instrument, use a 5 second
integration time.
t. Prepare TNT standards of 0.4g, 0.5g and 0.6g in 50ml
flasks in unsaturated DCE.
u. Run solvent blank using 10mm cell with spacer (or 1mm
cell). Fill cell with a Pasteur pipette. Wipe cell faces with soft tissue before
reading.
v. Next run three TNT standard solutions. Check linearity of
calibration curve. Correlation coefficient should be close
to 1.000.
w. Scan the filtrate solution to determine grams of TNT/50ml.
%TNT=100 (g of TNT per 50ml by UV)
Weight of Sample
Note: TNT content by UV can be confirmed by comparing it to the DCE extracted
weight. If the UV content is significantly greater, the sample may be contaminated.
4.4.2.6 Determination of cured resin and RDX/HMX
a. Connect the Kontes filtering dome to vacuum. Insert the funnel support with
tip inserted into the beaker. Place a piece of filter paper on the funnel support.
b. Weigh a PPE filter in a labeled aluminum dish.
c. Place the PPE filter on top of the filter paper. Clamp the filter funnel in place.
d. Add 2 grams of the ground composition B-5 sample to a 100 ml beaker.
e. Add 60-70ml of acetonitrile. Sonicate for 5-6 minutes.
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