EFP may refer to:
- European Federation of Periodontology, a non-profit, scientific dental organisation
- École Freudienne de Paris, a former French psychoanalytic professional body
- Electronic field production, a television industry term
- Electronic Fuel Pump, a common type of Fuel Pump.
- England First Party, a political party in England.
- European Federation for Primatology, a scientific society
- Explosively formed penetrator, a weapon
- European Foundation Project, an attempt to arrive at the legal form of a European Foundation
- École Franco-Polonaise, Franco Polish School of New Information and Communication Technologies in Poznan
- Exchange for Physicals, an off-market trading mechanism that enables customers to swap futures and options exposure for an offsetting stock position.
- European Film Promotion, a network of European film promotion organisations
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Explosively formed penetrator
An explosively formed penetrator (EFP), also known as an explosively formed projectile, a self-forging warhead, or a self-forging fragment, is a special type of shaped charge designed to penetrate armour effectively at standoff distances. As the name suggests, the effect of the explosive charge is to deform a metal plate into a slug or rod shape and accelerate it toward a target. They were first developed during WWII.
Difference from conventional shaped charges
A conventional shaped charge generally has a conical metal liner that projects a hypervelocity jet of metal able to penetrate steel armour to great depths; in travel over some distance the jet breaks up along its length into particles that drift out of alignment, greatly diminishing its effectiveness at a distance.
An EFP, on the other hand, has a liner face in the shape of a shallow dish. The force of the blast molds the liner into any of a number of shapes, depending on the shape of the plate and how the explosive is detonated. Some sophisticated EFP warheads have multiple detonators that can be fired in different arrangements causing different types of waveform in the explosive, resulting in either a long-rod penetrator, an aerodynamic slug projectile, or multiple high-velocity fragments. A less sophisticated approach for changing the formation of an EFP is the use of wire-mesh in front of the liner: with the mesh in place the liner fragments into multiple penetrators.
