MIL-PRF-16005F
acetone into the end of the PTFE tubing where the safety wire is protruding and allow it to flow down to
the adhesive. Allow the acetone to attack the adhesive for a few minutes or until the bond is broken, then
pull the safety wire out, leaving the platinum wire in the PTFE tubing. You should have a ~2 foot pigtail of
PTFE tubing with no platinum wire in it at both ends of the 20 foot length now. Flow deionized water
through the tubing to remove the acetone, then dry the tubing with a gaseous nitrogen stream. Obtain a
~5 inch length of 3 inch ID PVC pipe, and starting near one end, coil the platinum filled PTFE tubing
around it. Leave the pigtails free from the coil. Secure the coil at both ends of the PVC pipe with a loop
of safety wire so it does not unwind or change position. Obtain a 50 ml centrifuge tube and put 2 holes
through the lid that are large enough to clear the PTFE tubing. Obtain a peristaltic pump that has a flow
range from about 0.5 ml per minute to at least 15 ml per minute and an ice chest about 12 x 8 x 8 inch
internal dimensions. Set up the apparatus as shown in Figure 1.
FIGURE 1. Decomposition Assembly
4.4.3.2.2 Preparation. Temporarily remove the inlet and outlet ends of the coil from the
centrifuge tube. Place the inlet end in a beaker of with at least 500 ml of 5% nitric acid in it, place the
outlet end in a suitably sized waste beaker then pump the 5% nitric acid through the coil. Use a pump
speed of greater than 15 ml per minute. Repeat with 1000 ml of deionized water. Put a gentle stream of
GN2 through the tubing to dry it. Reassemble the apparatus as shown in Figure 1.
4.4.3.2.3 Procedure.
4.4.3.2.3.1 Preparing the Sample. Weigh the centrifuge tube to the nearest 0.01 grams and
record this as the tare weight. Transfer a volume of hydrogen peroxide to the centrifuge tube that should
be close to 50 grams, if the concentration is known and no more than 40 ml in any case. 70% hydrogen
peroxide corresponds to about 40 ml, 90% is about 36 ml and 100% would be about 35 ml. Weigh the
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