MIL-DTL-19264C (OS)
TABLE I. NACO composition.
Material
Specification
Percent by Weight
MIL-DTL-2441/
Nitrocellulose, Grade E, Type I
93.55 (nominal)
MIL-B-214652/
n-Butyl Stearate
3.00 ± 0.30
Ethyl Centralite, Class 2
MIL-E-255
1.20 ± 0.20
MIL-L-186183/
Basic Lead Carbonate
1.00 ± 0.20
Potassium Sulfate, Type I
MIL-P-193
1.25 ± 0.30
Moisture
-
1.00 (min) to 3.00 (max)
Total Volatiles
MIL-STD-652, Figure 1
5.0 max
Graphite, Grade IV
MIL-G-155
0.10 ± 0.05
1/ The nitrocellulose shall have an average nitrogen content of 12.00 ± 0.10 percent, and shall
have a viscosity of 5 ± 2 seconds. The required nitrogen content may be obtained by blending
nitrocellulose containing 11.90 to 12.20 percent nitrogen. Average nitrogen content
determination shall be made only when specifically requested in the contract (see 6.2).
2/ The n-butyl stearate specific gravity shall be determined at 25°C/25°C and the sample weight
shall be 2.5 to 3.2 grams for iodine test.
3/ The compatibility tests for lead carbonate with Cordite-N propellant shall not be performed.
Stability (C1). Using the 134.5° Celsius (C) heat test, the methyl violet test paper shall not fade
3.6
to a salmon-pink color in less than 40 minutes and the propellant shall not self initiate in less than 5 hours
(see 4.6.4).
Packing depth (M103). The minimum production packing depth (PPD) of the assessed charge
3.7
weight shall be 3.5 inches (measured from the case mouth) (see 4.6.5).
3.8
Gun ballistic assessment requirements.
3.8.1 Velocity (M104). The charge weight of the test propellant (TP) shall be assessed to result in a
nominal average projectile muzzle velocity matching that obtained for the reference propellant (RP) via
the powder proof firings (see 4.6.6.3.2).
3.8.2 Pressure (M105). The maximum allowed chamber pressure shall be 55,100 pounds per square
inch (psi) (see 4.6.6).
3.8.3 Velocity variation (M106). The maximum allowed projectile muzzle velocity standard deviation
shall be 10 feet per second (ft/sec) (see 4.6.6).
3.8.4 Pressure variation (M107). The maximum allowed chamber pressure standard deviation shall
be 1,700 psi (see 4.6.6).
Propellant interface test. All first article lots shall be subjected to the propellant interface test.
3.9
Production lots shall be subjected to the propellant interface test when directed by the procuring activity
(see 4.6.9 and 6.5).
3
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