Material Information

Ultem® PEI is a high performance polymer that is transparent amber in color. Ultem® PEI in general is high in strength and rigidity at elevated temperatures with long-term heat resistance. It is inherently flame resistant and low in smoke production. It also offers excellent dimensional stability, excellent electrical insulating properties, and a broad chemical resistance. It is easily machined and finished. This makes it ideal for use in medical reusable application where repeated sterilization is required.

The unfilled grade of Ultem® PEI is called Ultem® 1000. Ultem® 1000 excels in hot air and water environments because it is very hydrolytically stable. It is also UV and gamma radiation resistant. Ultem® 1000 is available in the form of film, sheet, and rod.


  • Reusable medical equipment
  • Electrical/electronic applications
  • Semiconductor burn in sockets
  • Aircraft/aerospace interiors
  • Food service
  • High temperature lighting bezels
  • Under-hood automotive applications
  • Medical instrument trays
  • Institutional kitchenware


  • Hydrolytically stable
  • UV and gamma radiation resistant
  • Excellent mechanical strength
  • Easily machined and finished
  • Outstanding heat resistance
  • Exceptional resistance to environmental forces
  • Inherent flame resistance with low smoke
  • High dielectric strength
  • Low dissipation factor over wide range of frequencies


Astm Test Method

Duratron® U1000 PEI (Ultem® 1000)

Density (lb/in^3) D792 0.046
Specific Gravity D792 1.28
Water Absorption @ 24 hours (%) D570 0.25
Water Saturation (%) D570 1.25


Tensile Strength (PSI) D638 16,500
Tensile Modulus (PSI) D638 500,000
Tensile Elongation at Break (%) D638 80
Flexural Strength (PSI) D790 20,000
Flexural Modulus (PSI) D790 500,000
Compressive Strength (PSI) D695 22,000
Compressive Modulus (PSI) D695 480,000
Izod Impact (Notched), ft-lb/in D256 0.5
Rockwell Hardness D785 M112, R125


Coefficient of Thermal Expansion,
D696 3.1
Heat Deflection Temperature 264 psi, ºF D648 400
Glass Transition Temp, ºF D3418 410
Continous Service Temp (Operating), °F  – 340
Thermal Conductivity, BTU-in/hr-ft² °F C177 0.85
Flammability Rating UL94 VO


Dielectric Strength, Short Term,
(Volts/Mil) @ .125″ Thick
D149 830
Surface Resistivity (ohms/square) EOS/ESD S11.11 > 10^13
Dielectric Constant at 1 KHz D150 3.15
Dissipation Factor at 1 KHz D150 0.0013


The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.