Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1/4 of steel. The tensile strength of carbon fiber resin composite materials is generally above 3500Mpa, which is 7-9 times that of steel. The tensile modulus of elasticity is 23000. ~43000Mpa is also higher than steel.

Therefore, the specific strength of CFRP, that is, the ratio of the strength of the material to its density, can reach more than 2000Mpa/(g/cm3), while the specific strength of A3 steel is only about 59Mpa/(g/cm3), and its specific modulus is also higher than that of steel.