Ultem® PEI

For the ultimate performance in high-heat/high-strength applications.

One of the most frequently used high-performance materials on the market, Ultem PEI combines exceptional strength and rigidity with excellent thermal properties, including outstanding heat resistance under continuous operating temperatures of 340°F (170°C). For increased rigidity, Ultem PEI can be reinforced with glass fiber.

In addition, Ultem PEI offers consistent electrical properties across a wide range of frequencies. These attributes, coupled with ease of machining and fabrication, makes Ultem PEI ideal for use in a multitude of high heat/high strength applications within the medical, pharmaceutical, aerospace and electronics industries.


  • Amorphous thermoplastic
  • Light amber color (unfilled)
  • Semi-transparent
  • Extremely rigid
  • UFDA/USDA and USP class VI compliant


  • Continuous rigidity and strength to 340°F (170°C)
  • Dimensionally stable
  • Excellent flame and heat resistance (UL 94 V-0 rated)
  • Consistent dielectric properties over a range of frequencies
  • Good acid resistance
  • High resistance to autoclave sanitizing
  • Low moisture absorption


  • Reusable machined components
  • Manifolds
  • Electrical insulators
  • Electrical component housings
  • Aircraft instrumentation


  • Medical and pharmaceutical
  • Electronics manufacturing
  • Semiconductor design
  • Aircraft and aerospace
  • Automotive