II.8Electrically driven explosive detonators

– Comprising the following types:(i) Exploding bridge (EB) detonators;(ii) Exploding bridge wire (EBW) detonators;(iii) Slapper detonators;(iv) Exploding foil initiators (EFI).Note:– The detonators subject to control all utilise a small electrical conductor such as a bridge, bridge wire or foil, that explosively vaporises when a fast, high-current electrical pulse is passed through it.– In non-slapper types, the exploding conductor starts a chemical detonation in a contacting high explosive material such as PETN (pentaerythritol tetranitrate).– In slapper detonators, the explosive vaporisation of the electrical conductor drives a flyer or slapper across a gap; when the slapper impacts an explosive, it starts a chemical detonation. The slapper in some designs is driven by magnetic force.– The term exploding foil detonator may refer to either an EB or a slapper-type detonator.