PEEK Fiber

PEEK Fiber combines exceptional tensile strength, abrasion resistance, and chemical inertness in a lightweight form. Its high temperature tolerance and excellent fatigue resistance make it suitable for reinforcing composites, producing industrial sewing threads, and fabricating filtration media. Industries such as aerospace, oil and gas, and automotive use PEEK fibres in braided cable coverings, high-strength composite laminates, and chemically resistant filter fabrics. In research, they support the development of lightweight, high-performance textiles and composite reinforcements with superior mechanical durability. Their combination of strength, resistance, and process versatility makes PEEK fibres a key material in both structural and functional high-tech applications.

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

Mechanical Properties

Element	Value
Coefficient of friction	0.18
Hardness - Rockwell	M99
Poisson's ratio	0.4
Elongation at break( % )	50
Tensile modulus( GPa )	3.7-4
Izod impact strength( J m⁻¹ )	85
Tensile strength( MPa )	70-100

Electrical Properties

Element	Value
Dielectric constant @1kHz	3.2-3.3@50Hz-10Khz
Dissipation factor @ 1MHz	0.003
Dielectric strength( kV mm⁻¹ )	190@50µm
Volume resistivity( Ohmcm )	10¹⁵-10¹⁶

Physical Properties

Element	Value
Flammability	V-0 @ 1.5mm
Radiation resistance	Good
Resistance to Ultra-violet	Fair
Limiting oxygen index( % )	35
Water absorption - equilibrium( % )	0.5
Water absorption - over 24 hours( % )	0.1-0.3
Density( gcm⁻³ )	1.26-1.32

Thermal Properties

Element	Value
Heat-deflection temperature - 0.45MPa( C )	260
Heat-deflection temperature - 1.8MPa( C )	160
Upper working temperature( C )	250
Specific heat( J K⁻¹ kg⁻¹ )	1340
Thermal conductivity( W m⁻¹ K⁻¹ )	0.25@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	47-108