In 1965, while working on the synthesis of new lightweight yet strong materials for use in tires because of the anticipated gasoline shortage, Stephanie Kwolek at DuPont accidentally discovered Kevlar-the registered trademark name of para-aramid polymers used in bulletproof vests and other armor applications. Kevlar was later found to be stronger than steel.
The exceptional strength-to-weight properties are brought by the peptide/amide bond, which confers structural rigidity and resistance to hydrolysis. In addition to having the exceptional properties of a covalent bond, the peptide bond displays strong intermolecular interactions such as the hydrogen bonding of the carbonyl groups, which, together with the aromatic pi-pi stacking interactions, are indispensable for making Kevlar one of the most used synthetic materials in different industries.
so Kevlar is stronger than the teflon