ULTEM Part from AON3D

3D Printing with ULTEM™

ULTEM™ 9085 (also known as PEI, or polyetherimide) is a versatile thermoplastic used in 3D printing which offers excellent mechanical strength and temperature resistance.


  • High strength-to-weight ratio
  • Extremely high dimensional stability with low creep sensitivity
  • Superb ductility
  • Stable electrical properties at multiple frequencies
  • Lightweight, with a density of 1.34 g/cm3


  • Performs continuously up to 170°C (340°F)
  • UL 94 V-0 flame-retardant polymer
  • Flame, smoke and toxicity (FST) compliant
  • Tolerates repeated autoclave cycles
  • Glass transition temperature of 217°C (293°F)
  • Melting temperature of 330-350°C (626-662°F)


  • Resists hydrolysis from steam, water and saline water
  • Strong chemical resistance to wide variety of chemicals, including automotive and aerospace fluids, as well as alcohols and weak acids

When to Use ULTEM™ for 3D Printing

The Right Kind of Flame Resistance

FST-compliance is an important requirement for in many automotive, rail, and aerospace applications and ULTEM™ 9085 offers extremely low smoke emissions with low toxicity when exposed to flame.

Lightweight and Strong

Its high stability and high strength-to-weight ratio paired with low density make ULTEM™ 9085 an attractive material to use when you are looking for weight-reduction options.

Cost-Effective High Performance

ULTEM™ 9085 is substantially less expensive than the other ultra high-performance thermoplastics – especially when compared to many closed-source competitor materials.

Challenges with 3D Printing ULTEM™

Heated Build Chamber Required

High glass transition temperature materials must be 3D printed with careful attention to nozzle, bed, and chamber temperatures. Our actively heated build chamber with massive convective turnover creates isothermal ambient print conditions, which control dimensional accuracy and manage the forces created during thermoplastic shrinkage.

3D Printed ULTEM™ Parts

Ultem 9085 3D Printed Parts by AON3D
Large Ultem 9085 Part in AON3D 3D Printer
Ultem 9085 Printed Parts from AON-M2 Industrial 3D Printer

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