Aramid fibra est generalis nomen aromatici columnae polyamide fibra. Et alienum notam nomen est Kevlar fibra. In turba coepit investigationis in MCMLXVIII et feliciter developed in MCMLXXIII. Patria nomine Aramid alimentorum fibra. 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 De Tensile Vitium (II) Quod fortitudo valde reducitur cum patere ultraviolet radios.