Kevlar : Heat-resistant and Strong Synthetic Fiber
Kevlar is a heat-resistant and strong synthetic fiber, the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
It 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. It also is used to make modern marching drum heads that withstand high impact.
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Kevlar is certainly an asset when building large structures. With a less rigid composition than steel however, it could reform the way we think of large load-bearing structures.
It maintains its strength and resilience down to cryogenic temperatures (−196 °C); in fact, it is slightly stronger at low temperatures.
At higher temperatures the tensile strength is immediately reduced by about 10–20%, and after some hours the strength progressively reduces further. For example: enduring 160 °C (320 °F) for 500 hours, its strength is reduced by about 10%; and enduring 260 °C (500 °F) for 70 hours, its strength is reduced by about 50%
Several grades of Kevlar are available:
in industrial applications, such as cables, asbestos replacement, tires, and brake linings.
high modulus used in cable and rope products.
colored version of Kevlar
higher-elongation, flexible and more fatigue resistant
higher tenacity for ballistic applications
highest tenacity for ballistic, armor, and aerospace applications
Is Kevlar costly ?
Yes, it is costly to produce, involving a complex process of spinning fibers and the use of sulfuric acid.
Strength of Kevlar
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