Rapid Prototyping Guide: Methods, Materials, and Process Selection
A breakdown of FDM, SLA, SLS, MJF, and CNC machining for prototype development: when to use each, how to match process and material to your validation goal.
Read the ArticleULTEM 9085 3D Printing Material
Fused Deposition Modeling (FDM) · High-Temp
Aerospace-grade PEI with high strength-to-weight and flame retardancy.
What Is ULTEM 9085?
ULTEM 9085 is a high-performance PEI thermoplastic offering an excellent strength-to-weight ratio, high heat resistance, and inherent flame, smoke, and toxicity (FST) performance. It is widely specified for aerospace, rail, and demanding industrial end-use parts.
Polyetherimide (PEI) 9085, printed with Fused Deposition Modeling (FDM). Every order is reviewed by our engineering team - no minimum order quantity.
When to choose ULTEM 9085
Choose ULTEM 9085 when your part must meet aerospace or transit flame-smoke-toxicity (FST) requirements, typically FAR 25.853, EN 45545, or equivalent specifications. ULTEM 9085 is one of the few 3D-printable materials that is widely accepted for certified flight hardware and rail interiors. No other material in our catalog matches its combination of FST performance, strength-to-weight, and 153 °C heat deflection.
If your primary need is flame retardancy without aerospace FST certification, PC-FR offers lower cost and shorter lead time, with UL 94 V-0 rating and 113 °C HDT. PC-FR handles most industrial electrical and enclosure applications.
If your application exceeds 153 °C or requires chemical resistance and sterilizability, ULTEM 1010 is the step up - it reaches 216 °C HDT and withstands autoclaving and harsh chemicals. The trade-off between 9085 and 1010 is: 9085 for FST/aerospace, 1010 for temperature and chemical extremes.
Material Properties
Representative values - process- and orientation-dependent. Full technical datasheet available on request.
Process
Fused Deposition Modeling (FDM)
Tensile strength
42–69 MPa
Elongation at break
5–6%
Flexural modulus
2,050–2,300 MPa
Heat deflection (HDT)
153 °C @ 1.82 MPa
Density
1.34 g/cm³
Max build size
Large-format (manual)
Min wall thickness
1.0 mm
Resolution / layer
150–250 µm
Relative cost
$$$$ (1 = lowest, 4 = highest)
Design Guidelines
Plan features to print reliably and assemble cleanly in ULTEM 9085. Need DFM help?
Min wall
1.0–1.5 mm - 1.6 mm+ for load
Min hole Ø
1.5 mm - ream for precision
Clearance
0.4–0.6 mm - fit & moving parts
Heat (HDT)
≈ 153 °C @ 1.82 MPa - high-load rating
Dimensional tolerances
Typical tolerance is ±0.25 mm or ±0.2% on industrial FDM platforms - tighter than desktop FDM. ULTEM 9085 has controlled, predictable shrinkage that industrial machines compensate for automatically. Anisotropy between XY and Z directions is present - Z-axis tensile strength is roughly 40–60% of XY. Orient critical load paths along XY axes. Post-machining is available for critical features.
Printing notes
ULTEM 9085 requires industrial FDM equipment (Stratasys Fortus-class or equivalent) with chamber temperatures of 180–200 °C and nozzle temperatures of 350–400 °C. This is not printable on desktop machines. Build times are longer due to the high-temperature process and required soak/cool-down cycles. ULTEM is highly hygroscopic and requires aggressive drying (150 °C, 4+ hours in industrial dryers). Support material is ULTEM-specific (breakaway or soluble depending on geometry) and support removal can leave witness marks.
How ULTEM 9085 Compares
ULTEM 9085 alongside related materials.
| ULTEM 9085 | ULTEM 1010 | PC-FR | PA12 (SLS) | |
|---|---|---|---|---|
| Tensile strength | 42–69 MPa | 48–81 MPa | 60 ± 4 MPa | 48 MPa |
| Heat deflection (HDT) | 153 °C @ 1.82 MPa | 216 °C @ 0.45 MPa | 113 °C @ 0.45 MPa | 154 °C @ 0.45 MPa |
| Flexural modulus | 2,050–2,300 MPa | 2,230–2,820 MPa | 1,890 ± 70 MPa | 1,730 MPa |
| Elongation | 5–6% | 3–6% | 5–8% | 15–20% |
| Density | 1.34 g/cm³ | 1.27 g/cm³ | 1.20 g/cm³ | 1.01 g/cm³ |
| Relative cost | $$$$ | $$$$ | $$ | $$$ |
When to Use ULTEM 9085
Where ULTEM 9085 fits, where it doesn't, and what to use instead.
Aerospace brackets and ducting
FST-rated to FAR 25.853 with 42–69 MPa tensile at only 1.34 g/cm³ - one of the few printable materials accepted for certified flight hardware in cabin and cockpit interiors.
AerospaceRail and transit interior panels
Meets EN 45545 smoke and toxicity requirements for passenger-car interior components, eliminating the need for secondary fire-barrier coatings.
AerospaceHigh-temp jigs and fixtures
153 °C HDT survives autoclave lay-up environments and composite-cure ovens that destroy nylon or ABS tooling within a single cycle.
EngineeringUnder-hood automotive components
Handles sustained engine-bay temperatures of 130–150 °C for air ducting, sensor housings, and wire-routing brackets in motorsport and OEM development.
AutomotiveFlight-rated prototype and end-use parts
Saves 50–70% weight versus aluminum for comparable-strength brackets, with no CNC tooling cost - viable for 1–200 unit aerospace production.
AerospaceStrengths
- 153 °C HDT at 1.82 MPa - handles engine bays, autoclave ovens, and sustained thermal environments that destroy every desktop FDM material
- Inherent FST (flame-smoke-toxicity) performance meeting FAR 25.853 and EN 45545 without coatings or treatments
- Strength-to-weight ratio competitive with aluminum at a fraction of the weight (1.34 vs 2.70 g/cm³)
Keep in mind
- $$$$ cost tier with 5–10 business day lead time - budget accordingly for prototype schedules
- Z-axis tensile strength is 40–60% of XY - orient critical load paths in-plane and discuss anisotropy with our team at DFM review
- Not printable on desktop FDM - requires industrial Stratasys-class equipment with 180–200 °C chamber and 350–400 °C nozzle
Finishes & Colors
Finishing options and in-stock colors for ULTEM 9085.
Standard
As-printed industrial finish; support removal.
Best for: End-use & aerospace parts
In-Stock Colors
Tan
Black
Custom colors and dyeing available on request. Contact us for options.
ULTEM 9085 FAQ
Choose it for parts that must survive high heat and meet aerospace/transit flame-smoke-toxicity requirements while staying lightweight. For even higher temperature or chemical resistance, consider ULTEM 1010.
Certifications and documentation can be discussed at quote. Contact us with your requirements.
PC-FR (UL 94 V-0, 113 °C HDT) is the lower-cost option for industrial and electrical flame-retardant applications. ULTEM 9085 (FST-rated, 153 °C HDT) is required for aerospace/transit FST compliance and operates at higher temperatures. Choose based on certification requirements and temperature.
Yes. At 42–69 MPa tensile and a density of 1.34 g/cm³, ULTEM 9085 has an excellent strength-to-weight ratio. It is used for aerospace brackets, ducting, and structural interior components. Z-axis strength is 40–60% of XY, so orient critical load paths accordingly.
Lead time for ULTEM 9085 is typically 5–10 business days depending on geometry and quantity. Rush options may be available - ask at quote.
Yes. Its 153 °C HDT handles engine-bay temperatures. ULTEM 9085 is used for air ducting, sensor housings, and bracketry in motorsport and automotive development. For sustained exposure above 150 °C, consider ULTEM 1010.
Industrial FDM platforms achieve ±0.25 mm or ±0.2% on ULTEM parts - tighter than desktop FDM. Critical features can be post-machined. Discuss tolerance requirements at quote and we will confirm achievability.
ULTEM 9085 saves 50–70% weight compared to aluminum for comparable-strength brackets and housings. For low-volume aerospace parts (1–200 units), printed ULTEM avoids CNC tooling setup cost. For high-volume or maximum-strength needs, machined metal is better.
Technical Documents
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