MIL-DTL-17124F
samples. For Type I samples, secure the blasting cap approximately six (6) inches from the end
using adhesive tape, so that it is almost completely covered with tape except for the ends. For
Type II samples, secure the blasting cap to the detonating cord's square cut dry end using a butt
joint; the end of the blasting cap shall be in immediate contact with the detonating cord's
explosive core. Initiate the blasting cap. The sample and lot shall be rejected if all samples do
not detonate completely.
4.19 Solar radiation test (Type I and II). From each of the five (5) spools, cut a sample
approximately fifteen (15) feet in length. The test shall be performed in accordance with MIL-
STD-810, Method 505.5, Procedure II at the specified chamber air temperature, radiant energy,
and number of hours. The lengths shall be coiled in circles approximately four (4) feet in
diameter and placed in a horizontal plane on a perforated stainless steel tray. Upon completion
of the solar radiation conditioning visually inspect the sample for degradation such as breaks,
cracks, deformation, and changes in color. Compare the samples to a section of unconditioned
detonating cord. If applicable, changes in color due to changing wax opacity or migration into
the textile wrapping may be permissible if not indicative of degradation and the sample continues
to meet the breaking strength and velocity of detonation requirements after the cold conditioning
of 4.20. The samples and lot shall be rejected if all samples are not free of visual degradation.
At the conclusion of this test, these samples shall be subjected to cold conditioning per 4.20.
4.20 Cold conditioning test (Type I and II). Use the samples subjected to the solar
radiation test, 4.19. Wind the cord in loose elliptical coils, approximately one foot by two feet.
Place the coils in a perforated stainless steel basket and condition the samples at -65 ± 2°F for 72
hours, minimum. After the 72 hours, increase the chamber temperature to laboratory ambient
conditions for one (1) hour, minimum. Upon completion of conditioning, measure the samples'
diameters in accordance with 4.8 and visually inspect for degradation such as breaks, cracks,
deformation, and changes in color. Compare the samples to a section of unconditioned
detonating cord. If applicable, changes in color due to changing wax opacity or cracking may be
permissible if not indicative of degradation; if wax coated cord changes color perform the
detonation test as specified in 4.13 and verify the velocity hasn't changed by subjecting a portion
of each sample to 4.12. Verify the breaking strength in accordance with 4.10. The sample and
lot shall be rejected if all samples are not free of visual degradation, does not meet the diameter,
does not meet the breaking strength requirement, changes in velocity of detonation (if
applicable), or does not completely function.
4.21 Flexibility test. From each of the five (5) spools, cut a sample approximately 2 feet
in length. For Type I Class C approximately 10 feet of detonating cord shall be selected from
each of the five spools. Subject the samples to the specified temperature for the specified length
of time. Remove one sample from the conditioning chamber and, without delay, securely wrap a
portion of the sample the mandrel. Visually inspect the cord for cracks. For Type I Class C, also
tie the detonating cord in any of two hitches and connections normally encountered in blasting
and demolition operations, see Figures 3 and 4 (also see 6.4), and then visually inspected for
cracks. Repeat the removal/wrapping/tying/inspection procedures for the remainder of the
samples. The sample and lot shall be rejected if the detonating cord cracks.
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