DuPont™ Kevlar® 29 Polyaramid Fiber (Polyparaphenylene terephthalamide)

DuPont™ Kevlar® 29 is a polyaramid fiber offered in Goodfellow's range of fibers. This fiber exhibits high tensile strength and modulus while maintaining flexibility. Kevlar® 29 also has excellent thermal, impact, and cut resistance. This fiber finds use in a wide variety of applications including bulletproof vests, helmets, ropes and cables, brake pads, and composites. With its exceptional combination of strength, heat resistance, and chemical stability, Kevlar® 29 stands out as a high-performance fiber.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Fiber

Filament Diameter		±25%
Number Of Yarns		±10%
Number Of Filaments		±10%
Tex Number		±10%
Length		+5% / -1%

Material Properties for Polymers

Chemical Resistance

Element	Value
Acids - concentrated	Poor
Acids - dilute	Fair
Alcohols	Good
Alkalis	Good-Poor
Aromatic hydrocarbons	Good
Greases and Oils	Good
Halogenated Hydrocarbons	Good
Halogens	Good
Ketones	Good

Physical Properties

Element	Value
Resistance to Ultra-violet	Fair
Water absorption( % )	3.5
Water absorption - equilibrium( % )	3.5
Density( gcm⁻³ )	1.44

Thermal Properties

Element	Value
Lower working temperature( C )	-200
Upper working temperature( C )	180-245
Specific heat( J K⁻¹ kg⁻¹ )	1400
Thermal conductivity( W m⁻¹ K⁻¹ )	0.04@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	-2Along Axis