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Formula: PEEK
Form: Disk
Material: Polyetheretherketone (PEEK)
CAS Number: 29658-26-2
Commodity: Polymers
Structure: Amorphous
Transparency: Transparent Pale Amber
PEEK Disk offers high strength-to-weight ratio, excellent wear resistance, and outstanding chemical stability, even at elevated temperatures. The machined disk form is used in demanding sealing, insulation, and structural applications across aerospace, medical, and semiconductor industries. Examples include sealing rings for high-temperature pumps, insulating barriers in semiconductor fabrication tools, and structural inserts in aerospace assemblies. In research, PEEK disks serve as test specimens for evaluating wear rates, dimensional stability, and chemical compatibility in aggressive environments. Their combination of machinability, performance retention under stress, and broad chemical resistance makes them ideal for critical components in advanced engineering systems.
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Tolerances

Disc
Thickness ±20%

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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