Aramid fibers are heat-resistant and strong synthetic fibers that are used for applications requiring high strength, such as aerospace, military body armor, bicycle tires, and asbestos substitutes. The document discusses the history and development of aramid fibers, including DuPont's introduction of Nomex in 1961 and Kevlar in 1973. It provides details on the structure, properties, and applications of Kevlar, including its high tensile strength, low elongation, and use in products like bulletproof vests, military clothing, reinforced pipes, and automobile seat belts and tires.

1. To my
presentation
Md Faisal Ahmed Biplob
ID:191003045

2. Presentation Topic
Aramid Fiber

3. Introduction
• Aramid are heat-resistant and strong
synthetic fibers.
• They are used in aerospace and
military applications, for ballistic rated
body armor,
bicycle tires, and an asbestos
substitute.
• The following characteristic distinguish
them from other polymers:
• High strength
• Good resistance to abrasion
• Good resistance to organic solvents
• Non-conductive
• No melting point
• Low flammability

4. History
• Meta aramid was first produced by
DuPont in 1961 under the trade name
of Nomex. This has similarity with
textile fiber having excellent heat
resistance.
• It was used extensively in the
production of protecting clothes , air
filtration ,insulation ,substitute as
asbestos.
• Meta aramid was also produced in
Netherland, Japan,Korea, China and
France.
• Stephene Kwolek working at DuPont
introduced first para-aramid called
Kevlar in 1973.

5. Types of Aramid
polymer:

6. Structure
Fig-1. Aramid fiber

7. General
features of
Kevlar:
• High Tensile Strength at Low Weight.
• Low Elongation to Break.
• High Modulus (Structural Rigidity).
• Low Electrical Conductivity.
• High Chemical Resistance.
• Low Thermal Shrinkage.
• High Toughness (Work-To-Break).
• Excellent Dimensional Stability.
• High Cut Resistance.
• Flame Resistant, Self-Extinguishing.

8. Characteristics
& Properties
• It has remarkable strength.
• It is stronger than fiber glass and
five times stronger than steel.
• All the Kevlar fibers show high
tensile strength and modulus.
• Kevlar 49 and Kevlar 149 even
much higher modulus.
• Benzene aromatic ring is the key
structure of Kevlar’s.

9. Different
Applications
• Aramid fiber uses in:-
a)Geotextile:-Reinforced
thermoplastic pipes.
b) Automobile Industries:-set belt,
helmets,Tire cord.
c) Defense fields:-bullet-proof
jacket, Military cloth.
d) Protective Textile-Body armor,
safety
boot.