MIL-DTL-19264C (OS)
4.6.1 Chemical analysis. The chemical composition shall be determined using the methods specified
in Table III. The requirements of 3.2 shall be met or the lot shall be rejected.
TABLE III. Chemical analysis test methods.
Material
Test Method of MIL-STD-286
Nitrocellulose
209.2.1
n-Butyl Stearate
222.1
Ethyl Centralite
202.2.3
Basic Lead Carbonate
311.1.3 or 316.1
Potassium Sulfate
310.3.1, 310.4.2, or 316.1
Moisture
103.5
Total Volatiles
103.5
Graphite
308.1.4
4.6.2 Grain dimensions. Grain dimensions shall be determined in accordance with MIL-STD-286,
method 504.1.1 or 504.6.1. The requirements of 3.3 shall be met or the lot shall be rejected.
4.6.3 Visual examination. The propellant grains selected for the physical characteristic tests shall be
visually examined prior to conducting the physical characteristic tests (4.6.1 and 4.6.2) to verify that:
a. Grain form conforms to the requirements of 3.3.
b. Grains are uniformly coated with graphite, conforming to the requirements of 3.4.
c. Workmanship conforms to the requirements of 3.10.
4.6.4 Stability. Stability shall be determined in accordance with MIL-STD-286, method 404.1.2
(134.5°C heat test). The requirements of 3.6 shall be met or the lot shall be rejected.
4.6.5 Packing depth. Prior to all maximum packing depth (MPD) pour testing the propellant shall be
conditioned for a minimum of four days at 90 ± 3° Fahrenheit (F). The MPD is the distance, measured to
the nearest tenth of an inch, from the case mouth to the upper level of any given propellant charge in a
loaded cartridge case. The PPD is the MPD, less the empirical value of 0.7 inches, in the MK 9 cartridge
case. MPD is determined by pouring the propellant charge steadily from a height of 30 inches above the
mouth of a primed case, over an interval of sixty (60) seconds while the outside of the case is briskly
tapped with a soft mallet adjacent to the rising level of the propellant during pouring. The MPD shall be
determined for each lot of propellant by pouring three (3) different charge weights, spanning the expected
assessed charge weight range, three (3) times each for a total of nine (9) pours. The MPD for each of the
nine (9) pours shall be recorded and a curve should be fitted to the PPD values derived from the MPD
pouring data to allow for interpolative prediction of the PPD. Subsequent to acceptance tests of each lot
of propellant, the assessed charge shall be poured a minimum of three times to determine the MPD and
the resultant PPD.
4.6.6
Ballistic testing.
4.6.6.1 Warming or conditioning rounds. Warming or conditioning rounds shall be fired to stabilize
gun temperature and eliminate the biasing effects of firing the propellant at various charge levels or
temperatures. The first round fired in a gun during a test is the warming round. The round fired as part of
a temperature conditioning group or charge level group wherein the velocity is expected to differ from the
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