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EXPERIMENTS WITH STATIC‐RESISTANT BLASTING CAPS *
Author(s) -
BANVILLE J. H.,
RICHARD H.
Publication year - 1960
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1960.tb01721.x
Subject(s) - rock blasting , detonation , range (aeronautics) , geology , materials science , geotechnical engineering , explosive material , chemistry , composite material , organic chemistry
A bstract Premature detonation of seismic blasting‐caps may be caused by the accumulation of an electrostatic charge. This is especially true in desert areas where there are many sandstorms. Two makes of static resistant cap have been tested in the laboratory and the results compared with those for non‐resistant caps made by the same manufacturers. The full results are given in the table, the breakdown voltage for the resistant caps is in the range 20–30,000 volts as compared with the range 10–15,000 volts for the ordinary cap. It is strongly recommended the static resistant caps should always be used and that experiments on premature detonation from this cause should bemade in the field. In January 1960, 20 crews in the Sahara used a total of 146,150 static‐resistant blasting caps.