Kevlar
A patented synthetic aramid fiber noted for its flexibility and light weight. It is to a great extent replacing fiberglass as a reinforcing fabric for composite construction.
Aviation Maintenance Technician Handbook — Airframe, p. G-20
Also defined in 1 more source
The registered trade name by DuPont for a patented aramid fiber.
Aviation Maintenance Technician Handbook — Powerplant, p. G-16