Carbon fiber (CF) is a new type of fiber material with high strength and high modulus fiber with carbon content of more than 95%. It is a microcrystalline graphite material made of organic fibers such as flake graphite microcrystalline stacked along the axial direction of the fiber, which is carbonized and graphitized.

Carbon fiber rod is "flexible outside and rigid inside". Its weight is lighter than that of metal aluminum, but its strength is higher than that of steel. It also has the characteristics of corrosion resistance and high modulus. It is an important material in national defense, military industry and civil use. It not only has the inherent characteristics of carbon materials, but also has the softness and processability of textile fibers. It is a new generation of reinforced fibers.

Carbon fiber rod has many excellent properties, such as high axial strength and modulus, low density, high specific performance, no creep, high temperature resistance in non oxidative environment, good fatigue resistance, specific heat and conductivity between non-metal and metal, low thermal expansion coefficient and anisotropy, good corrosion resistance, and good X-ray transmission.

Good electrical and thermal conductivity, good electromagnetic shielding, etc.

Compared with the traditional glass fiber, the young's modulus of carbon fiber rod is more than three times that of the traditional glass fiber rod; Compared with Kevlar fiber, the young's modulus of Kevlar fiber is about twice that of Kevlar fiber. It is insoluble in organic solvent, acid and alkali, and has outstanding corrosion resistance.

Carbon fiber rod is an inorganic polymer fiber with carbon content higher than 90%. Graphite fibers with carbon content higher than 99% are called graphite fibers. The microstructure of carbon fiber rod is similar to artificial graphite, which is a disordered graphite structure.