DRDO's exploding foil initiator or slapper detonators used in the firing mechanism of nuclear devices
Two types have been developed
1. Ceramic based
2. PCB based
The EFI detonator is similar to d design of an exploding bridge-wire in that a thin foil is exploded by the discharge +
of a high voltage capacitor; however, the energy from the exploding conductive foil (often copper) drives a thin plastic disc (often Kapton) situated on top at 2–5 km s−1.

These detonators r used for vry precise detonation of d multiple explosive lens surrounding the nuclear