Each of thousands of carbon fibers is more fine carbon fibers composed of a diameter of about 5-8 microns. In the atomic level with graphite carbon fiber is very similar, is composed of a layer of carbon atoms arranged in a hexagonal posed. The difference is that the link between the layers. Graphite is a crystal structure of the layered loosely linked, but not between carbon fibers crystal structure, the link layer is irregular. This will enhance the physical strength to prevent slippage.

Carbon fiber is excellent in the mechanical properties of a new material, 1/4, the tensile strength of the carbon fiber resin composite material which is generally less than the proportion in the steel more than 3500Mpa, is 7-9 times that of steel, the tensile elastic modulus of 23,000 ~ 43000Mpa also higher than steel. However, the performance of the carbon fiber material only along the fiber axis direction high strength, but poor impact resistance, easy to damage, so in the manufacture of structural components become often do avoid the use of the side exposed to light of the advantages of stretch-resistant part of the impact.