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Grade: DuPont™ Kevlar® 29
Formula: Polyparaphenylene terephthalamide
Form: Fiber
Material: Polyaramid
Commodity: Polymers

Kevlar® 29 Polyaramid Fiber (Polyparaphenylene terephthalamide)

Kevlar® 29 Polyaramid Fiber (Polyparaphenylene terephthalamide) is characterized by its high tensile strength-to-weight ratio and exceptional thermal stability, arising from its rigid molecular backbone and hydrogen-bonded crystalline domains. These properties enable outstanding durability, cut resistance, and resistance to thermal degradation even under extreme conditions. The fiber is widely applied in defense, aerospace, and automotive industries, where lightweight strength and impact resistance are critical. Specific technologies that benefit include ballistic protective gear, lightweight composites for aircraft and vehicles, and high-strength ropes and cables for industrial applications. In research and innovation, Kevlar® 29 has been central to studies on skin-core microstructures, fracture mechanics, and hierarchical fibrillar morphologies, providing insights into the design of next-generation high-performance fibers. Its value in scientific and industrial contexts lies in enabling safer, stronger, and more efficient solutions where mechanical reliability and lightweight performance are indispensable.
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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
Mechanical Properties
Element Value
Tensile modulus( GPa ) 59-124
Tensile strength( MPa ) 2760

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