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MIL-C-70501
(AR)
% Resin + % additives + % kraft + % polyester staple fiber
= 100 - (% NC + % Acrylic + % DPA)
4.5.1.3.6  Methylene  Chloride  Extractable.
Calculate the
total  methylene  chloride  extractable
total acetone extractables
4.5.2  Stability heat test (134.5C).
Samples shall be
tested in accordance with MIL-STD-286, Method 404.1.2, Heat
Tests at 134.5C.
4.5.3 Residue  test.
The test shall be performed at a
Government Proving Ground.  Empty containers will be loaded
with M10 propellant and sealed in accordance with dwg. 9312698.
Loaded containers shall then be assembled to inert-filled M720
cartridges in accordance with the appropriate zones as listed
Test rounds shall be conditioned for a
in Tables 2 or 3.
minimum of eight hours at 70F plus or minus 2.5F and
fired within two minutes after removal from conditioning
Rounds
environment.
shall be fired at night from a M224 mortar (standard or
ballistic tube) at a firing elevation of 800 mils, at a uniform
rate of twelve to fifteen rounds per minute.
The time of
descent for the round from muzzle to base shall not be more
than two seconds.  The tube shall be dry swabbed and the
elevation checked between the firing of each group.
Observation shall be made for
hangups, secondary flame, and
flaming debris.  The lot shall be
accepted if no hangups occur,
no rounds exhibit secondary flame
at any zone, and no flaming
debris reaches the ground at zone
4 only.
If a hangup occurs, the test round shall be removed from
the tube and an examination shall be conducted of the tube and
test round to determine if the hangup was caused by residue.
If the hangup was not caused by residue, the test shall be
If the hangup was caused by residue, firing of test
continued.
rounds shall be discontinued.  The tube shall be dry swabbed
and a group of reference rounds shall be immediately fired.
The reference round group shall consist of 25 rounds of the
same zone, configuration, and conditioning as the test round
except that loaded containers from an accepted lot shall be
used.  The reference group shall be fired after dry swabbing
19

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