MIL-PRF-46676B (AR)
b.c = the quantities obtained by multiplying the values listed in column "c" times the
number listed in column "b" for each corresponding drop height.
N = the sum of column "c"
A = the sum of column "b.c"
The 50 percent point shall be calculated as follows: if more non-explosions occurred than
explosions, the drop height associated with each explosion will be used in the calculations. If
more explosions occurs that non-explosions, the drop heights associated with each non-explosion
shall be used to calculate the 50 percent drop height in centimeters.
- if non-explosion values are used:
A
1
Log(50percentpoint) = C + 0.1(
+
)
N
2
- if explosion values are used:
A
1
Log(50percentpoint) = C + 0.1(
-
)
2
N
Where:
C = lowest drop height at which value used in the calculation was recorded in
column "a".
N = the sum of column "c"
A = the sum of column "b.c"
A 50 percent initiation height lower than that for Composition B shall be cause for
rejection.
4.3.5 Friction sensitivity. A sample 1/8 x 1/8 x 1/32 of an inch shall be placed on an
anvil of the sliding friction machine having a friction surface of (304 stainless steel) 60 micron
finish. A force of 900 to 1000 pounds shall be applied to the friction surface and a velocity of
approximately 8 feet per second to the anvil by striking it with a pendulum dropped from a 90
degree position. Twenty samples shall be selected for this test. Any evidence of decomposition
whether light or sound shall be cause for rejection.
4.3.6 Electrostatic sensitivity. A sample approximately 0.250 inches in diameter and
0.100 inches thick shall be placed on a metal anvil of the electrostatic machine. The metal needle
of the machine shall be adjusted so that when depressed the needle is 0.03 ± 0.003 inches from
the anvil surface. The anvil and the needle shall be connected to a condenser circuit having a
8
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