As a general rule, PETN is considered to be either a relatively insensitive primary explosive, or one of the most sensitive secondary explosives.
22.
If detonators with primary explosives are used, the shock wave of the initiating blast may set off the detonator and the attached charge.
23.
ANFO is a tertiary explosive, meaning that it cannot be set off by the small quantity of primary explosive in a typical blasting cap.
24.
Conventional blasting caps use electricity to heat a bridge wire rather than vaporize it, and that heating then causes the primary explosive to detonate.
25.
Besides the primary explosive material in the shoes, they also contained a small amount of a highly dangerous material that can be used as a detonator.
26.
A fuze may contain only the electronic or mechanical elements necessary to signal or actuate the detonator, but some fuzes contain a small amount of primary explosive to initiate the detonation.
27.
PETN was used for these detonators because it was safer than primary explosives like lead azide : while it was sensitive, it would not detonate below a threshold amount of energy.
28.
Fulminic acid and its salts ( fulminates ), for instance mercury fulminate, are very dangerous, and are often used as detonators for other explosive materials, and are examples of primary explosives.
29.
Firstly, there is a major safety issue, i . e . detonators are ( like all primary explosives ) much more sensitive to shock, heat, and friction than an explosive booster.
30.
In spark detonators, PETN is used to avoid the need for primary explosives; the energy needed for a successful direct initiation of PETN by an electric spark ranges between 10 60 mJ.
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