MIL-DTL-757C
omitting the sample. This will provide a value for the amount of ferric ammonium sulfate
equivalent to the 20.00 mL of titanous chloride solution. Calculate the percent nitrogen in the
sample as follows:
( A - B) × 0.00233N × 1000
Percent nitrogen =
W
where: A = ferric ammonium sulfate solution for the blank, mL.
B = ferric ammonium sulfate solution for the sample, mL.
N = normality of ferric ammonium sulfate solution.
W = weight of sample, g.
4.4.11.4 Nitrogen (alternate method). Determine the nitrogen content of the lead
styphnate in accordance with Method 409.1 of MIL-STD-650.
4.4.12 Onset of Decomposition. Determine the onset of exotherm peak temperature
using any commercially available differential scanning calorimeter, or other suitable thermal
analyzer. Set the ramp rate at 5ºC per minute and the starting temperature at 200ºC. The sample
cell of the instrument shall be at ambient temperature when loading the sample into it. Remove
the excess water from a sample of lead styphnate with a Whatman 40 ashless filter paper or
equivalent. Using the minimum amount of sample required for the instrument being used,
typically 0.1 0.5 mg, load the damp lead styphnate into the cell. Initiate the run. Upon
completion of the run, record the temperature at the maximum point of the exotherm. The
accuracy and precision of the instrument shall be periodically verified by means of standards that
melt above and below the specification range (indium and zinc are suggested). The test shall be
performed in triplicate with no greater than ± 10ºC variation between runs.
4.4.13 Lot numbering. Visually verify that an ammunition lot number has been applied
IAW MIL-STD-1168.
12
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business