MIL-DTL-17124F
witness lines have been completely severed. After the successful initiation of the donor,
function any of the remaining witness lines by securing a commercial Number 6 blasting cap six
(6) inches to one end of the donor using adhesive tape, so it is almost completely covered with
tape except for the ends. Verify complete detonation of each witness line. The sample and lot
shall be rejected if any of the samples do not detonate completely.
Witness lines
Donor
cardboard
board
6+ inches
Angle <15°
FIGURE 2. Example cutoff test setup (not to scale).
4.15 Detonation of TNT test (Type Ib, Ic and Ij). From each of the five (5) spools, cut
approximately six (6) feet. For each sample tie the cord snugly to a TNT demolition block with
three turns plus a half hitch on the end leading to the detonating cap. The other end should be
securely tucked beneath all the turns. Secure a commercial Number 6 blasting cap
approximately 6 inches from the end using adhesive tape, so it is almost completely covered with
tape except for the ends. Initiate the blasting cap. The sample and lot shall be rejected if the
TNT does not detonate high order.
4.16 Flame sensitivity test (Type I and II). From each of the five (5) spools, cut a sample
approximately six (6) inches in length. The specified amount of black powder complying with
MIL-P-223, Class 5, shall be spread around and over (including the open ends) each piece of
detonating cord and ignited. The samples and lot shall be rejected if the detonating cord
detonates.
4.17 Impact sensitivity test (Type I and II). From each of the five (5) spools, cut a sample
approximately six (6) inches in length. Each piece of detonating cord shall be placed on a steel
anvil. The specified bar shall be dropped onto the approximate the middle of each detonating
cord from the specified height. The detonating cord and lot shall be rejected if the detonating
cord detonates through one or both of its ends.
4.18 Waterproofness test (Type I and II). From one of the five (5) spools, cut a sample
approximately 80 feet in length. Keep approximately five (5) feet of one end out of the water
and immerse the remainder of the sample in water at the specified depth for the specified length
of time. After immersion is complete begin at the wet end of the cord and cut ten (10) - three (3)
foot lengths to be used as branch lines. The remaining cord shall be used as the main line
(approximately 50 feet long and includes the dry portion of the cord). Starting approximately
fifteen (15) feet from the dry end of the main line, attach each of the ten branch lines to the main
at approximate three foot intervals, using a girth hitch, see Figure 1. Ensure the main line is
straight and does not cross over on itself. Ensure the branch lines are at right angles to the main
line and do not cross other branch lines. Secure a commercial Number 6 blasting cap to the
10
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