Kevlar

Kevlar is a para-aramid synthetic fiber known for its extraordinary tensile strength-to-weight ratio. Developed by DuPont in the 1960s, Kevlar is five times stronger than steel on an equal-weight basis, making it invaluable in applications requiring extreme strength with minimal weight. In automotive applications, Kevlar appears primarily in composite structures, often combined with carbon fiber to create hybrid composites that leverage Kevlar's superior impact resistance and carbon fiber's stiffness. The material excels in applications subject to impact or abrasion: brake pads (where Kevlar fibers enhance friction properties and reduce dust), timing belts, drive belts, and reinforcement for hoses. Kevlar's heat resistance and flame retardancy make it suitable for components near heat sources. Unlike carbon fiber, Kevlar is not electrically conductive, and it exhibits excellent vibration damping. The material's distinctive golden-yellow color is sometimes showcased in visible composite parts as a design element. However, Kevlar's difficulty in machining and poor compression strength compared to carbon fiber limit its applications.