Excellent properties of carbon fiber carbon fiber is a kind of fibrous carbon material with more than 90% carbon content. It is made of organic fibers such as polyacrylonitrile (Pan) fiber, viscose fiber, asphalt fiber, etc. by pre oxidation, carbonization, graphitization and other high-temperature solid-state reaction process. It is composed of preferred orientation graphite microcrystals, so it has high strength and elastic modulus (rigidity). Its specific gravity ranges from 1.70g/cm3 to 1.80g/cm3, its strength ranges from 1200Mpa to 7000mpa, its elastic modulus ranges from 200GPa to 400gpa, and its coefficient of thermal expansion is close to zero or even negative (~ 1.5) × 10-6)。

At the same time, carbon fiber has a series of excellent properties, such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, conductivity, heat transfer and low coefficient of thermal expansion. These excellent comprehensive properties make carbon fiber the most important reinforcing fiber of advanced composites, which can be used to strengthen polymers (thermosetting and thermoplastic polymers) to form high-performance polymer matrix composites; Metal matrix composites of carbon / aluminum, carbon / magnesium and carbon / copper are composed of reinforced aluminum, magnesium and copper; High temperature resistant ceramic matrix composites are composed of reinforced carbon and ceramics. Carbon fiber composites can be made into various high-performance components which can meet a variety of requirements through the optimization design of matrix, fiber selection, carbon fiber content and distribution.

Glass fiber is a kind of inorganic non-metallic material with excellent performance. It has many kinds of advantages, such as good insulation, strong heat resistance, good corrosion resistance and high mechanical strength, but its disadvantages are brittle and poor wear resistance. It is made of glass balls or waste glass by high temperature melting, wire drawing, winding, weaving and other processes. The diameter of single filament is several microns to more than 20 microns, which is equivalent to 1 / 20-1 / 5 of a hair. Each bundle of fiber precursor is composed of hundreds or even thousands of single filaments.