Kevlar® is a high strength (5 times that of steel),
high modulus (75% of carbon fiber) aramid fiber.
Aramid is technically an aromatic polyamide,
which is a complex hydrocarbon and a distant
cousin of nylon. Kevlar® is the most impact
resistant fiber on the market, also exhibits the
highest tensile strength and highest resistance
to damage, vibration and crack propagation.
However, Kevlar® has very low compressive
strength, so it is recommended that laminates
carrying bending or compression loads have
carbon fiber incorporated into the laminate to
provide adequate stiffness. Kevlar® is also
hygroscopic, ultra violet sensitive and un-sandable,
thus it is not recommended as a sheathing or outer
ply of the laminate. Kevlar® is categorized by weight
per sq. yd., available in a cloth weave and sold by
the running foot.