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Vestakeep® L4000G PEEK Granules

Grade: Vestakeep® L4000G
Formula: PEEK
Form: Granule
Material: Polyetheretherketone (PEEK)
CAS Number: 29658-26-2
Commodity: Polymers
Nominal Granule Size: 6mm
Viscosity: High Viscosity
Vestakeep® L4000G PEEK Granules are a high-performance engineering thermoplastic within the Goodfellow range of granulated polymers. With 14 variations available, they offer properties like high tensile strength, hardness and excellent chemical resistance. L4000G is suitable for a range of applications including precision machined components, bearings, valves, and pumps across industries like oil and gas, aerospace and automotive. The granulated form allows for convenient processing techniques like injection molding to produce end-use parts.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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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

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