Aramid fiber is the general name of aromatic column polyamide fiber. The foreign brand name is Kevlar fiber. The company began research in 1968 and successfully developed it in 1973. my country named it aramid fiber. The characteristics of aramid fiber: high strength, high modulus, high temperature resistance, corrosion resistance, low density Advantages: (1) no melting (2) high strength at high temperature (3) fatigue resistance, good wear resistance (4) Compared with inorganic fibers, it has better shock absorption (5) Heat resistance disadvantages: (1) The compressibility is poor, and the compressive strength is less than 1/5 of the tensile strength (2) The strength is greatly reduced when exposed to ultraviolet rays.