Long carbon fiber is a new material with high strength and high modulus and excellent mechanical properties. It is a microcrystalline graphite material obtained by carbonization and graphitization of organic fibers. Its specific gravity is less than 1/4 of steel, and its strength is higher than that of steel. Corrosion resistant, high modulus, no melting. And a variety of resin substrates after impregnation extrusion molding into pellets, long carbon fiber polymer. Can be used for direct molding products. In recent years, it has been widely used in aerospace, mechanical and electronic chemicals.