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0.350 I I I I I
.c
3 O-.-----
l-0 0 o-0 -0
0.250
” 0.300
SHOCK INITIATION PROPERTIES
0 = PRECIPITATED
0 = BALL-MILLED
4-O
Fig. 4.19. Small-scale gap test sensitivity of RDX vs
specific surface at loading density = 0.80 g/cm3.
0.350 I I I I I
0.2ccJ
0 = PRECIPITATED
0 = BALL-MILLED
I I I I I I
2000 4OW 6OCG SO00 I0000 12ocm
s,’ kn12/g 1
Fig. 4.20. Small-scale gap test sensitivity of RDX vs
specific surface at loading density = 1.00 g/cm3.
4.3. Minilmum Priming Charge. The minimum priming charge test determines
the quantity of some initiator or booster explosive that will cause high-order
detonation in the test explosive in half the trials. This test has been used to deter-
mine both the relative effectiveness of various initiator explosives and the relative
sensitivities of various test explosives. The basic property of the test explosive is its
ability to build up to a high-order detonation after a short, intense, geometrically
small, and usually highly divergent shock wave is induced from the priming charge.
Figure 4.21 shows the LASL version of this test. The test charge is a 2-in.-diam by
2-in.-high cylinder. A hemispherical cavity milled into one face is filled with a
putty-like explosive, XTX 8003, prepared by roll-milling 80 parts of a specially
recrystallizied PETN with 20 parts of an uncatalyzed silicone resin (Dow Corning
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