The full name of AF is “aramid fiber”, which is a new type of high-tech synthetic fiber with excellent properties such as ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Its strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, its toughness is 2 times that of steel wire, and its weight is only about 1/5 of that of steel wire. Decomposes, does not melt. It has good insulation and anti-aging properties and has a long life cycle. The discovery of aramid is considered to be a very important historical process in the material industry.