Kevlar, formerly known as KEVLAR in English, is also translated as Kevlar or Kevlar. It is the brand name of an aramid fiber material product developed by the American company DuPont. The original name of the material is "poly-p-phenylene terephthalamide", and the repeating unit of the chemical formula is -[-CO-C6H4-CONH- C6H4-NH-]-The amide group attached to the benzene ring is a para-position structure (the meta-position structure is another product with a brand name Nomex, commonly known as fire-resistant fiber).