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Polyetherimide ( PEI )

Material Information

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Standard products are available in these forms
Film Granule Rod Sheet Tube
Film Granule Rod Sheet Tube

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Common Brand Names:
Ultem
 
General Description:  

General Description : An amorphous, transparent and amber high performance thermoplastic with the characteristics common to this group - see PEEK. Relative to PEEK it is less temperature resistant, less expensive and lower in impact strength. It is prone to stress cracking in chlorinated solvents.

Applications include electrical switchgear, connectors and other components, microwaveable cookware and "under-bonnet" components.

   

Chemical Resistance

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

Dielectric constant @1kHz 3.1
Dielectric strength ( kV mm-1 ) 30 @ 1.6mm
Dissipation factor @ 1MHz 0.0013 @ 1KHz
Surface resistivity ( Ohm/sq ) 4.1013
Volume resistivity ( Ohmcm ) 7.1015

Mechanical Properties

Abrasive resistance - ASTM D1044 ( mg/1000 cycles ) 10
Compressive modulus ( GPa ) 2.9
Compressive strength ( MPa ) 140
Elongation at break ( % ) 60
Hardness - Rockwell R125
Izod impact strength ( J m-1 ) 50
Poisson's ratio 0.44
Tensile modulus ( GPa ) 2.9
Tensile strength ( MPa ) 85

Physical Properties

Density ( g cm-3 ) 1.27
Flammability V-0 @ 0.4mm
Limiting oxygen index ( % ) 47
Radiation resistance Good
Resistance to Ultra-violet Good/Fair
Water absorption - equilibrium ( % ) 1.3
Water absorption - over 24 hours ( % ) 0.25

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 56
Heat-deflection temperature - 0.45MPa ( C ) 200
Heat-deflection temperature - 1.8MPa ( C ) 190
Specific heat ( J K-1 kg-1 ) 2000
Thermal conductivity @23C ( W m-1 K-1 ) 0.22
Upper working temperature ( C ) 170-200

Properties for Polyetherimide Film

Property Value
Dielectric Strength @25µm thick kV mm-1 254
Dissipation Factor @1MHz 0.0023 @ 1KHz
Elongation at Break % 15
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.01
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 1
Tensile modulus - Longitudinal GPa 2.5
Tensile modulus - Transverse GPa 2.5
Tensile strength - Longitudinal MPa 85
Tensile strength - Transverse MPa 85
Volume Resistivity Ohmcm 5.1015
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Polyetherimide on-line

Standard products are available in these forms
Film Granule Rod Sheet Tube
Film Granule Rod Sheet Tube

Choose a form to search our on-line catalog  

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