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Ultem is the ultimate plastic for high-heat applications

Ultem®(Polyetherimide, PEI)

  • Heat, solvent and flame resistant
  • High dielectric strength and stability
  • Excellent mechanical properties
  • Rigid and strong
  • Exceptional resistance to environmental forces


Ultem® is the ideal choice for demanding, high-heat applications. This material can withstand continuous operating temperatures of 340° F while maintaining strength and rigidity. It is easily fabricated and bonded and offers excellent chemical resistance and high dielectric strength.

Ultem is the high-performance material of choice for many aerospace, aircraft, medical and pharmaceutical applications. It offers exceptional mechanical properties and exhibits natural flame resistance and extremely low smoke generation.


  • Jet engine components
  • Microwaves
  • Medical components
  • Manifolds
  • Electronic / electrical insulators


Our application engineers can help. With decades of experience in plastic material selection, we'll help you choose the optimal plastic for your application and budget.

To compare
the cost of this material to other thermoplastics, click here.

General Material Properties

Property   Metric units   English units
Density   1.26e3 - 1.28e3 kg/m^3   0.0455 - 0.0462 lb/ft^3
Yield Strength   7.35e7 - 8.11e7 Pa   10.7 - 11.8 ksi
Tensile Strength   9.19e7 - 1.01e8 Pa   13.3 - 14.7 ksi
Elongation   0.558 - 0.645 % strain   55.8 - 64.5 % strain
Hardness (Vickers)   2.17e8 - 2.38e8 Pa   22.1 - 24.3 HV
Impact Strength (notched)   3.81e3 - 4.2e3 J/m^2   1.81 - 2.0 ft.lbf/in^2
Fracture Toughness   1.99e6 - 4.03e6 Pa/m^0.5   1.81 - 3.67 ksi/in^0.5
Young's Modulus   2.89e9 - 3.04e9 Pa   0.419 - 0.441 10^6 psi
Max Service Temperature   161 - 179 °C   322 - 354 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.47e3 - 1.53e3 J/kg °C   0.352 - 0.366 BTU/lb. °F
Thermal Expansion Coefficent   8.46e-5 - 1.01e-4 strain/°C   47 - 56 µstrain/°F
CO2 Footprint   6.93 - 7.66 kg/kg   6.93 - 7.66 lb/lb
Recycleable   Yes   Yes

The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.

Posting Date: August 16, 2012