Impact and Thermal Sensitivity of Commercial Detonators.
Becker KR; Cooper JC; Watson RW
NTIS: PB 249 879 :17 pages
A variety of commercial detonators (fuse type and electric instantaneous and delay types) were subjected to impact and thermal stimuli to determine initiation stimulus levels and the dominant parameters in resistance to initiation. In the impact trials, the detonators were impacted along their length to find the most sensitive region; threshold initiation limits obtained for these regions ranged from 3.47 to 20.82 Joules (2.6 to 15.4 Ft-lb). The friction sensitivity of the explosive component was an important parameter in determining sensitivity; various construction features of nonexplosive components played a role as well. In the thermal sensitivity trials, the detonators were heated from ambient to 100 deg c at an average rate of about 1.0 Deg c/min. and thereafter at 0.5 Deg c/min until they exploded; the explosion temperatures observed ranged from 121 deg to 188 deg c. These temperatures correlated quite well with the reaction temperatures of certain characteristic explosive components used by different manufacturers. The data also indicated an effect of confinement on explosion temperatures of detonators.
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