3 years. Kevlar is a trademark used by DuPont in the United States for aromatic polyamide fiber ("aramid" for short). This fiber was invented by DuPont in the 1960s. Kevlar is a registered trademark of DuPont. trademark. The biggest feature of this Kevlar wire is that it has strong tensile strength, is durable, and is not afraid of rot. And after it encounters water, its pulling force doubles. Properly maintained, it has a long lifespan.