Combined 3D Services

ULTEM 3D Printing: The High-Performance Material for Extreme Environments

Posted on by Shelle Parsons

By Mike Moussa, PE — ULTEM (polyetherimide/PEI) is the material you use when nothing else survives. Here’s a deep dive on what makes it special, where it excels, and when it’s worth the premium.

What Is ULTEM?

ULTEM is a family of high-performance thermoplastics made by SABIC (originally developed by GE Plastics). The two grades most commonly used in 3D printing are:

  • ULTEM 9085 — The FST (flame, smoke, toxicity) certified grade. Approved for aircraft cabin interiors per FAR 25.853. The default choice for aerospace applications.
  • ULTEM 1010 — Higher strength and heat resistance than 9085. Better mechanical properties, but not FST certified out of the box. Used in tooling, industrial, and non-cabin aerospace applications.

Why ULTEM?

Temperature Resistance

ULTEM maintains structural integrity at temperatures that would destroy conventional 3D printing materials:

  • ULTEM 9085: HDT of 153°C (307°F), continuous use to ~170°C (338°F)
  • ULTEM 1010: HDT of 216°C (421°F), continuous use to ~210°C (410°F)
  • Compare: ABS softens at ~100°C, Nylon at ~80-180°C depending on grade

If your part lives near engines, exhaust systems, electrical equipment, or autoclaves — ULTEM handles it.

Flame, Smoke, and Toxicity (FST) Performance

ULTEM 9085 is one of the few 3D-printable materials that passes aerospace FST requirements:

  • FAR 25.853 — vertical burn test for aircraft cabin materials
  • Low smoke density — critical for enclosed spaces (aircraft cabins, ships, transit vehicles)
  • Low toxic gas emission — doesn’t produce dangerous gases when exposed to flame
  • OSU 65/65 — heat release rate compliance for many applications

This isn’t just an aerospace requirement. Any enclosed space where people breathe — trains, buses, ships, submarines, server rooms, mining equipment — benefits from FST-rated materials.

Chemical Resistance

ULTEM resists a wide range of chemicals:

  • Jet fuel (JP-8), hydraulic fluids, and aviation oils
  • Automotive fluids — brake fluid, coolant, transmission fluid
  • Industrial solvents — MEK, acetone (limited exposure), alcohols
  • Cleaning agents and disinfectants — important for medical and food service

Strength and Stiffness

ULTEM isn’t just heat resistant — it’s a genuinely strong engineering plastic:

  • Tensile strength: 47-81 MPa (depending on grade and print orientation)
  • Flexural modulus: 2,200-2,800 MPa — significantly stiffer than Nylon or ABS
  • Good fatigue resistance for repeated loading applications

Applications

Aerospace

  • Cabin interior components (ducting, brackets, covers, cable management)
  • Engine compartment brackets and housings
  • Autoclave tooling for composite layup
  • Wind tunnel models
  • UAV/drone structural components

Automotive and Motorsport

  • Under-hood components that survive engine bay temperatures
  • Brake duct adapters and heat shielding
  • Turbo inlet prototypes and functional testing parts
  • Racing components where weight and heat resistance both matter

Industrial and Manufacturing

  • Autoclave-compatible tooling and fixtures
  • Chemical processing components
  • Electrical connectors and housings for high-temperature environments
  • Sterilizable tooling for food and pharmaceutical manufacturing

Firearms and Defense

  • Accessory components that survive sustained firing temperatures
  • Handguards, grip panels, and stock components
  • Suppressor baffles and end caps for testing and evaluation
  • Optic mount prototypes for thermal and recoil testing
  • Parts that need to handle propellant gases, carbon fouling, and CLP solvents

ULTEM’s combination of heat resistance, chemical resistance, and structural strength makes it uniquely suited for firearms applications where parts are exposed to extreme thermal cycling, cleaning solvents, and mechanical stress.

Medical

  • Autoclave-sterilizable surgical instruments and guides
  • Reusable medical device housings
  • Lab equipment that undergoes repeated sterilization

Cost and Lead Time

ULTEM is a premium material — expect 2-4x the cost of standard ABS or Nylon printing. This is driven by:

  • Raw material cost (ULTEM filament is $300-500/kg vs $25-50 for ABS)
  • Print chamber temperatures of 170-200°C required (specialized equipment)
  • Slower print speeds for quality and adhesion

Typical costs:

  • Small bracket (2″ × 1″ × 1″): $50-100
  • Medium housing (4″ × 3″ × 2″): $150-400
  • Large duct section (12″ × 4″): $400-1,200

Lead time: 5-10 business days typical, rush available.

When ULTEM Is Overkill

Not every high-temp application needs ULTEM. Consider these alternatives first:

  • PC (Polycarbonate) — good to ~130°C, much cheaper. Fine for automotive under-dash and many industrial applications.
  • PA6 or PA12 (Nylon) — good to ~80-180°C depending on grade. Tougher and cheaper for many structural applications.
  • ASA — UV stable for outdoor use. If heat isn’t extreme and you need weather resistance, ASA is 1/10 the cost.

Use ULTEM when you genuinely need the temperature rating, the FST compliance, or the chemical resistance. We’ll tell you honestly if a cheaper material will do the job.

Get Started

Send us your model (STEP, STL, or SolidWorks) or describe what you need. We’ll recommend the right ULTEM grade and give you an honest quote.

📧 info@partsnap.com | 📞 (214) 449-1455 | Request an ULTEM Quote