23 Facts About Kevlar


Kevlar is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.

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Kevlar has many applications, ranging from bicycle tires and racing sails to bulletproof vests, all due to its high tensile strength-to-weight ratio; by this measure it is five times stronger than steel.

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Poly-paraphenylene terephthalamide – branded Kevlar – was invented by the American chemist Stephanie Kwolek while working for DuPont, in anticipation of a gasoline shortage.

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Kevlar 149 was invented by Dr Jacob Lahijani of Dupont in the 1980s.

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Kevlar production is expensive because of the difficulties arising from using concentrated sulfuric acid, needed to keep the water-insoluble polymer in solution during its synthesis and spinning.

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Kevlar is often used in the field of cryogenics for its low thermal conductivity and high strength relative to other materials for suspension purposes.

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Kevlar is a well-known component of personal armor such as combat helmets, ballistic face masks, and ballistic vests.

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Kevlar is used to manufacture gloves, sleeves, jackets, chaps and other articles of clothing designed to protect users from cuts, abrasions and heat.

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Kevlar-based protective gear is often considerably lighter and thinner than equivalent gear made of more traditional materials.

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In table tennis, plies of Kevlar are added to custom ply blades, or paddles, in order to increase bounce and reduce weight.

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Kevlar has been found to have useful acoustic properties for loudspeaker cones, specifically for bass and mid range drive units.

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Additionally, Kevlar has been used as a strength member in fiber optic cables such as the ones used for audio data transmissions.

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Kevlar can be used as an acoustic core on bows for string instruments.

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Remo's Falam Slam patch is made with Kevlar and is used to reinforce bass drum heads where the beater strikes.

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Kevlar is sometimes used in structural components of cars, especially high-value performance cars such as the Ferrari F40.

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Kevlar is sometimes used as a substitute for Teflon in some non-stick frying pans.

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Kevlar fiber is used in rope and in cable, where the fibers are kept parallel within a polyethylene sleeve.

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Kevlar is widely used as a protective outer sheath for optical fiber cable, as its strength protects the cable from damage and kinking.

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Kevlar was used by scientists at Georgia Institute of Technology as a base textile for an experiment in electricity-producing clothing.

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Kevlar can be found as a reinforcing layer in rubber bellows expansion joints and rubber hoses, for use in high temperature applications, and for its high strength.

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Some cellphones have a Kevlar backplate, chosen over other materials such as carbon fiber due to its resilience and lack of interference with signal transmission.

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Kevlar 149, the strongest fiber and most crystalline in structure, is an alternative in certain parts of aircraft construction.

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The wing leading edge is one application, Kevlar being less prone than carbon or glass fiber to break in bird collisions.

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