MIL-DTL-398D
Sample test card for Holston short impact test method
SHORT METHOD
IMPACT SENSITIVITY
RUN
HMX AT 26 CM
RUN
RDX AT 33 CM
IF BATCH IS REJECT - RUN IMPACT BY LONG METHOD
USE OTHER SIDE OF CARD
ACCEPT _____________
REJECT _____________
LONG METHOD _________CM
4
R
R
R
R
R
R
NUMBER
3
RR
R
R
R
o
o
o
o
o
A
OF
2
Roo
o
o
o
o
o
o
o
A
A
EXPLOSIONS
1
oooo
o
o
o
o
o
o
A
A
A
0
oooo
o
A
A
A
A
A
A
A
A
1234
5
6
7
8
9
10
11
12
13
TEST NUMBER
NOTE:
A - Zone for acceptance
R - Rejected by the short method, and a test with the long
impact method (see 4.7.8.4.2) must be performed.
4.7.8.4.2 Holston long impact method. Pass a dry sample of
RDX through a sample splitter or roll and quarter on glazed paper
until a representative sample of about 5 gram is obtained.
Position 25 brass percussion caps (0.303 inch diameter and 0.20
inch in height) with open end up on a flat surface. Fill a 0.025
g (25 mg) loading spoon with RDX, remove the excess material by
passing the flat edge of a wooden spatula across flat surface of
the spoon and transfer the portion remaining in the spoon to one
of the percussion caps. Repeat the RDX loading procedure until
all of the percussion caps are loaded. Be sure the RDX is evenly
distributed in each of the percussion caps. Turn on the exhaust
fan in order to remove the dust and fumes from the impact machine
enclosure. Using laboratory tongs place a loaded percussion cap
on the anvil of the impact machine. Insert a plunger through the
guide hole above the anvil and into the open end of the
percussion cap. Turn the electromagnet power switch on. Turn
the gear handle until the base of the lower electromagnet arm
coincides with the 35 cm mark on the right guide bar. Lower the
safety shield and lift the weight vertically until it is held in
place by the electromagnet. Face the opposite direction of the
impact machine and turn the electromagnet switch to the OFF
position allowing the weight to fall and strike the plunger.
22
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