The Hornet uses advanced composite materials for large portions of its structure. Aluminum comprises about half of structural weight, while steel contributes about 16.7 percent. Titanium makes up some 12.9 percent, used for a considerable fraction of the wings, fin and horizontal tail attachments and wing-fold joints. About 40 percent of the aircraft's outer skin is covered by a graphite/epoxy composite material, accounting for up 9.9 percent of the aircraft's weight. The remaining 10.9 percent is composed of plastic, rubber, steel, fiberglass, aramid and other materials.
