Kevlar is a strong synthetic fiber made from aromatic polyamide. It was invented in 1965 by Stephanie Kwolek while working for DuPont. Kevlar has very high tensile strength despite its low weight, and is flame resistant, stiff, and resistant to chemicals and heat. It finds applications in body armor, helmets, vehicle armor, and other protective equipment due to its strength and impact absorption properties. Kevlar also has everyday uses such as in cell phone covers, apparel, ropes, tires, and fire-resistant materials.

2. Kevlar® Fiber
 Kevlar® is a material formed by combining para-
phenylenediamine and terephthaloyl chloride. Aromatic
polyamide (aramid) threads are the result.
Kevlar was invented by Stephanie Kwolek while working
for DuPont in 1965 but commercial use began in 1971 .

3. Chemical Reaction
 The reaction of 1,4-phenylene-diamine (para-
phenylenediamine) with terephthaloyl chloride yielding
Kevlar.

4. Advantages
 High tensile strength at low weight
 Flame resistant, self extinguishing
 Low electrical conductivity
 High chemical resistance
 Excellent dimensional stability
 Low thermal shrinkage
 Low elongation to break
 High toughness (work-to-break)
 High cut resistance
 High modulus (structural rigidity)

5. Disadvantages
1. Despite its strength and resilience, Kevlar also has some
disadvantages which limits its efficiency.
2. Kevlar fibers quickly absorb moisture, meaning it is more
sensitive to its environment than other materials.
3. Although Kevlar is strong its ability to cope with
compression is fairly poor. It can be difficult to cut.
Specially made scissors are usually required to cut the
fabric

6. Applications in Military
 Vehicle Armor
 Vehicle frame and body protection .
 protects aircraft and helicopter crews.
 Military Helmets
 Absorb 20% more kinetic energy for Ground Troops
 Improve mobility and fatigue of the solders because of
low weight.
 Body Armor
 Improved Outer Tactical Vest, ballistic, throat and groin
protectors, anti-mine boots and chaps.

7. Applications in Military
Vehicle Armor:

8. Applications in Military
Military Helmets

9. Applications in Military

10. Applications in Military
Body Armor

11. Applications in Military
Tactical Vest

12. Applications in Military

13. Applications in Military
K9 units protection

14. Personal security

15. How it works

16. HOW IT WORKS?
When a bullet strikes body armor, it is caught in a
“web” of very strong fibers. These fibers absorb and
disperse the impact energy that is transmitted to
the bullet proof vest from the bullet, causing the
bullet to deform or “mushroom.”

17. CONTINUE
 Effect of Bullet Hit

18. Everyday Kevlar
Cell phone back covers:

19. Everyday Kevlar
 Pants and apparel

20. Everyday Kevlar
 Motorcycle helmets
and gloves

21. Everyday Kevlar
 Riding protection

22. Everyday Kevlar
Personal Electronics

23. Everyday Kevlar
Reinforcement material for some car and
bicycle tyres and climbing ropes.

24. Sports
Sporting goods:

25. Everyday Kevlar
Fire Resistant Mattresses and vests:

26. Any
Questions ???