Note: We offer Kevlar #49 which is not suitable for bulletproof materials (Style #29 is used for ballistics).
Kevlar was developed in the early 1960's by Dupont by spinning poly-paraphenylene terephthalamide synthetic fibers. Assuming the same weight, Kevlar is literally five times stronger than steel. Kevlar fibers also have 43 percent less density than fiberglass. Originally developed to replace steel tire belts, it is an aramid with high strength and notable heat resistance. para-aramid fiber has tremendous strength, and is heat and cut resistant. Para-aramid fibers do not rust or corrode, and their strength is unaffected by immersion in water. When woven together, para-aramid fibers are known as Kevlar. Kevlar also makes a good choice for mooring lines and other underwater objects. Kevlar's biggest weakness is its lack of compressive strength.
Why is Kevlar so useful for composites? A few reasons: