High temperature performance, mechanical properties, radiation resistance, fire resistance, low smoke, non-toxic, hydrolysis resistance and chemical resistance. With these excellent properties, PEEK can be applied to make some parts in aero and aircraft to replace aluminum and other metallic material. PEEK can also be made into some large parts with strict requirements because of its low density and processing performance. PEEK gets excellent flame retardant properties, so people make it into parts in carbon. If the plane is on fire, its inherent fire resistance and little smoke can reduce the risk of fire.