Prepreg (preimpregnated fabric)
A type of composite material in which the reinforcing fibers are encapsulated in an uncured resin. Prepreg materials must be kept refrigerated to prevent them from curing before they are used.
Aviation Maintenance Technician Handbook — Airframe, p. G-27
Also defined in 1 more source
Preimpregnated fabric. A type of composite material in which the reinforcing fibers are encapsulated in an uncured resin. Prepreg materials are cut to size and shape and laid up with the correct ply orientation, and the entire component is cured with heat and pressure.
Aviation Maintenance Technician Handbook — Powerplant, p. G-21