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Formula: PEI
Form: Rod
Material: Polyetherimide (PEI)
CAS Number: 61128-46-9
Commodity: Polymers
PEI Rod combines high mechanical strength, thermal stability, and chemical resistance in a rigid cylindrical form, enabling precise machining and structural use in extreme environments. It retains dimensional stability at elevated temperatures and resists hydrolysis, making it ideal for aerospace, semiconductor, and industrial equipment components. Industries use PEI rods for high-precision insulators, structural supports in thermal chambers, and chemically resistant mechanical parts. Specific applications include semiconductor wafer handling tools, load-bearing components in aerospace interiors, and fixtures for aggressive chemical processing. In research, PEI rods support mechanical performance studies at high temperatures, thermal expansion analysis, and prototyping of precision-engineered parts. The combination of strength, heat tolerance, and machinability ensures their importance in critical manufacturing and scientific operations.
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Tolerances

Rod
Diameter +20% / -10%

Material Properties for Polymers

Chemical Resistance
Element Value
Acids - concentrated Good(-Fair?)
Acids - dilute Good
Alcohols Good
Alkalis Good-Poor
Aromatic hydrocarbons Poor
Greases and Oils Good
Halogenated Hydrocarbons Good-Poor
Ketones Poor
Electrical Properties
Element Value
Dielectric constant @1kHz 3.1
Dissipation factor @ 1MHz 0.0013@1
Dielectric strength( kV mm⁻¹ ) 30@1.6mm
Surface resistivity( Ohm/sq ) 4.10¹³
Volume resistivity( Ohmcm ) 7.10¹⁵
Physical Properties
Element Value
Flammability V-0 @ 0.4mm
Radiation resistance Good
Resistance to Ultra-violet Good/Fair
Limiting oxygen index( % ) 47
Water absorption - equilibrium( % ) 1.3
Water absorption - over 24 hours( % ) 0.25
Density( gcm⁻³ ) 1.27
Mechanical Properties
Element Value
Hardness - Rockwell R125
Poisson's ratio 0.44
Elongation at break( % ) 60
Compressive modulus( GPa ) 2.9
Tensile modulus( GPa ) 2.9
Izod impact strength( J m⁻¹ ) 50
Abrasive resistance - ASTM D1044( mg/1000 cycles ) 10
Tensile strength( MPa ) 85
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 200
Heat-deflection temperature - 1.8MPa( C ) 190
Upper working temperature( C ) 170-200
Specific heat( J K⁻¹ kg⁻¹ ) 2000
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.22@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 56
Pultrusions
Element Value
Compressive strength( MPa ) 140

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