Innovation of Kevlar

1. ENGLISH PRESENTATION
NAME:ROHAN BERA
REG. NO:18BIS0037
TITLE-KEVLAR

2. KEVLAR
• Kevlar is a heat-resistant and strong synthetic fiber, related to other aramids such
as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, this
high-strength material was first commercially used in the early 1970s as a
replacement for steel in racing tires. Typically it is spun into ropes or fabric sheets
that can be used as such or as an ingredient in composite material component

3. ADVANTAGES
• Kevlar fibre is a Para-aramid fibre with tensile strength of about 3,620 MPa and
relative density of 1.44
• Kevlar maintains its strength and resilience down to cryogenic temperatures (−196
°C)
• 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.
• High cut resistance
• Low thermal shrinkage
• Flame resistant, self extinguishing

4. DISADVANTAGES
• Kevlar fibers quickly absorb moisture,meaning it is more sensitive to its environment
than other materials.
• Although Kevlar is strong,its ablility to cope with compression is fairly poor.It can be
difficult to cut.Specially made scissors are usually required to cutthe fabric.
• It suffers more corrosion if exposed to chlorine
• Kevlar reacts very badly to UV light that’s why UV stablilizer is required for outdoor
applications.

5. APPLICATIONS

6. THE END
REFERENCES
• https://en.wikipedia.org/wiki/Kevlar
• Google images