Carbon nanotube
In 2009, Zyvex Technologies introduced carbon nanotube-reinforced epoxy and carbon pre-pregs. Carbon nanotube reinforced polymer (CNRP) is several times stronger and tougher than CFRP and is used in the Lockheed Martin F-35 Lightning II as a structural material for aircraft. CNRP still uses carbon fiber as the primary reinforcement, but the binding matrix is a carbon nanotube-filled epoxy.