Technical Guide for Kevlar Aramid Fiber

By Eun-Beum Lee

ENGL 314

ContentContent

Introduction General Information of Kevlar Aramid Fiber General Features of Kevlar Aramid Fiber Commercial Products of Kevlar Aramid fiber Product Applications Conclusion

IntroductionIntroduction Kevlar aramid fiber is the commercial name for poly(p-

phenylene terephtalamide) Kevlar is registered trade mark of Du Pont Co. Kevlar is an organic fiber in the aromatic polyamide

(aramid) family. Kevlar has high strength, stiffness, toughness, and thermal

stability Kevlar is used in a wide range of areas because of unique

properties

General Information of Kevlar General Information of Kevlar Aramid fiberAramid fiber

Development: By S. L. Kwolek, a Du Pont research scientist, synthesized a series of para-oriented aromatic polyamides (1965)

Chemical Structure

General Information of Kevlar General Information of Kevlar Aramid fiber(Cont’d)Aramid fiber(Cont’d)

Reason for being a strong material - Hydrogen bonding, Radial orientation.

Hydrogen Bonding and Radial Orientation

General Features of Kevlar General Features of Kevlar Aramid FiberAramid Fiber

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

Commercial Products of Kevlar Aramid FiberCommercial Products of Kevlar Aramid Fiber

Filament form-KEVLAR 29,49,68,100, 119, 129, 149. Kevlar 29 -Representative, Rubber Reinforcing, Personal protection vests,

Reinforcement for hard armor, helmets, Spall Panels, electronic housing protection

Kevlar 49 - High modulus type, Composite, marine sporting goods, and aerospace applications

Kevlar 68 - Medium type between 29 and 49 Kevlar 100 - Colored Kevlar, Gloves, Protective Apparel Kevlar 119 - High durable, Tire, V-belt, Hose, C-belt Kevlar 129 - High tenacity type, Ballistic vest, Rope, Tire Kevlar 149 - Ultra high modulus type, Composite, Rope

Commercial Products of Kevlar Aramid Fiber Commercial Products of Kevlar Aramid Fiber (Cont’d)(Cont’d)

Staple Form - Spun yarn –Felt, Nonwoven-Magnetic Card Pulp Form - Fibrillized, Brake, Clutch. Gasket: Containing water by

35, 50% Chopped fiber -6-13mm, Clutch facing

Products FormsProducts Forms

Product ApplicationsProduct Applications

Fiber-reinforced Composites Fibrous Armor Systems Fiber-reinforced Rubber goods Ropes and Cables with Kevlar Fiber Kevlar Aramid Pulp

Fiber-reinforced CompositesFiber-reinforced Composites

Using high tensile Strength and Modulus, light weight, thermal and dimensional stability, and other unique properties of Kevlar Fiber

Using of Product: Kevlar 49 and 149 Advantages: light weight, high tensile

strength and modulus, outstanding toughness and high impact resistance

Applications: aerospace, automotive parts, protruded articles, ships, and boats, friction products, sporting goods, and aramid/aluminum laminates

Fibrous Armor SystemsFibrous Armor Systems(Ballistic Applications)(Ballistic Applications)

Purpose: protection of human lives and vital equipment against ballistic Threats

Using of Product: Kevlar 29, 49, and 129

Fabrics of Kevlar 29: Composite Armor Applications

Fabrics of Kevlar 129: Civilian Body Armor

Applications: soft and composite armor, Helmets, and Spall Liners with Kevlar Fiber in Combat Vehicles etc.

Fiber–reinforced Rubber GoodsFiber–reinforced Rubber Goods

Applications of rubber goods The Purpose of reinforcement: to improve strength,

stiffness, mechanical functions, and durability Suitable reasons for reinforcing the tires, hoses, belts, and

miscellaneous goods: excellent tensile properties, and light weight

Using of Product: Kevlar 119 Uses: Storage bins, Waterproof Covers, Frictional Surface,

Inflatable devices such as balloons, aircraft evacuation slides, and rafts

Ropes and Cables of Kevlar Aramid FiberRopes and Cables of Kevlar Aramid Fiber

Ropes and Cables with Kevlar Fiber: High Strength, and Light Weight

Extensive development and applications in Ropes and Cables

Using of Product: Kevlar 29 and 49 yarns

Applications:Antennae Guide Wires, Fish line, Industrial and Marine utility ropes, Lifting Slings, Emergency Tow Lines, Netting and Webbing

Kevlar Aramid PulpKevlar Aramid Pulp

Kevlar aramid pulp for industrial paper and elastomeric reinforcement

Asbestos Replacements: Friction Products, Gaskets, Industrial paper, and Thixotrope for adhesives, sealants, and coatings

ConclusionConclusion

Kevlar Aramid Fiber has high strength and high modulus, stiffness, and thermal stability

This unique properties make it an outstanding fiber or use in broad product applications

Technological development of Kevlar Fiber will probably dictate further increases in fiber mechanical and thermal properties