Why ULTEM™ 9085 Is the Go-To PEI Filament for Aerospace and High-Temperature 3D Printing

In aerospace environments where flame, smoke, and toxicity are strictly regulated, only a handful of 3D printing materials qualify. ULTEM™ 9085 is one of them.

ULTEM™ 9085 is a high-performance PEI, or polyetherimide, resin produced by SABIC and processed into filament at 3DXTECH. It has become a go-to material across aerospace, automotive, and industrial manufacturing because it delivers a rare combination of lightweight strength, chemical resistance, and inherent flame retardancy. These characteristics make ULTEM™ 9085 a trusted material for demanding, regulated environments.

Mechanically, ULTEM™ 9085 delivers a tensile strength of approximately 54 megapascals and a tensile modulus of around 2,500 megapascals. It also offers a flexural strength of roughly 90 megapascals, with a flexural modulus of about 2,170 megapascals. The heat deflection temperature of ULTEM™ 9085 is approximately 158 degrees Celsius, allowing it to maintain structural integrity in elevated-temperature environments.

One of the primary reasons ULTEM™ 9085 is so popular in the aerospace industry is its flame rating. It is UL 94 V-0 rated and FAA-approved for FST applications, meaning it meets strict Flame, Smoke, and Toxicity requirements. If the material is exposed to flame, it will self-extinguish once the flame source is removed, and any smoke produced remains below regulated toxicity thresholds.

ULTEM™ 9085 also meets FAR standards, making it suitable for aerospace seating applications. While this certification is most commonly associated with foamed versions of the material, it further reinforces ULTEM™ 9085’s credibility within the aerospace sector.

When it comes to real-world applications, ULTEM™ 9085 is especially valuable in aircraft interiors. Many interior components encountered during a flight, including vents, bin dividers, armrests, and light panels, are commonly made from this material, with an increasing number now being additively manufactured. Its low smoke generation, flame resistance, and ability to withstand aggressive cleaning chemicals make it well suited for these environments.

Outside of aerospace, ULTEM™ 9085 sees regular use in automotive and industrial applications where lightweight construction, elevated temperatures, and chemical exposure overlap. Under-the-hood components, electronic housings, clips, and fixtures all benefit from its resistance to hydrocarbons, road salts, and automotive fluids.

Compared to ULTEM™ 1010, ULTEM™ 9085 is more ductile and impact resistant. While 1010 offers a higher thermal ceiling, 9085 is often the better choice for parts that see mechanical stress, vibration, or repeated contact with moving components.

Printing with ULTEM™ 9085 does require a more advanced printer, similar to other high-temperature materials. While it does not demand the same extreme conditions as ULTEM™ 1010, it still requires significantly more heat than standard engineering materials. Through internal testing, 3DXTECH has found that a chamber temperature around 190 degrees Celsius delivers optimal layer adhesion, Z-strength, and dimensional stability. Lower chamber temperatures may produce parts, but often at the expense of mechanical performance and warp control. Given the investment required for a material like ULTEM™ 9085, optimizing the process to extract maximum performance is critical.

ULTEM™ 9085 is also highly moisture sensitive. The filament is dried at 150 degrees Celsius before shipment and spooled on high-temperature reels, allowing users to re-dry the material safely if needed.

In addition to standard ULTEM™ 9085, 3DXTECH also offers specialized variants designed for specific production environments.

CarbonX™ PEI 9085+CF is compounded using SABIC ULTEM™ 9085 resin and 15 percent high-modulus carbon fiber. This formulation increases stiffness, strength, and dimensional stability while maintaining excellent printability. CarbonX™ PEI 9085+CF is purpose-built for structural, aerospace-grade applications where tight tolerances and long-term stability matter.

For Stratasys users, TRITON3D PEI 9085 is formulated to be compatible with Stratasys printers. This material delivers the same inherent flame resistance, low smoke toxicity, and thermal stability expected from ULTEM™ 9085, while including replacement EEPROM chips in order to enable use on Stratasys printers. It is guaranteed to work in Stratasys systems and provides a significantly more cost-effective alternative to OEM filament.

For additional information about ULTEM™ 9085 or to determine which variant best fits a specific application, explore the related product pages or contact the 3DXTECH team for questions.

ULTEM™ 9085 demonstrates that additive manufacturing is no longer limited to prototypes; it is already flying, driving, and working in some of the most demanding environments in the world.

ULTEM™ 9085 FAQ: Performance, Printer Requirements, and Comparisons

1. Is ULTEM™ 9085 better than ULTEM™ 1010?

ULTEM™ 9085 and ULTEM™ 1010 are both high-performance PEI (polyetherimide) 3D printing materials, but they are optimized for different priorities.

ULTEM™ 9085 is generally considered the better choice for aerospace interiors and structural components that require a balance of flame resistance, ductility, and impact strength. It is UL 94 V-0 rated and FAA-approved for Flame, Smoke, and Toxicity (FST) requirements, making it widely used in regulated aerospace applications.

ULTEM™ 1010 offers a higher thermal ceiling and is better suited for extreme heat environments where maximum temperature resistance is the primary requirement. However, ULTEM™ 9085 is typically more ductile and impact resistant, making it preferable for parts exposed to vibration, mechanical stress, and repeated loading. It is also slightly easier to print than ULTEM™ 1010, requiring less extreme thermal conditions while still delivering aerospace-grade performance.

In short:

• Choose ULTEM™ 9085 for aerospace compliance, toughness, balanced high-temperature performance, and slightly easier printability.

• Choose ULTEM™ 1010 for maximum heat resistance in extreme industrial environments.

2. What kind of 3D printer do you need for ULTEM™ 9085?

Printing ULTEM™ 9085 requires an industrial high-temperature 3D printer capable of maintaining elevated chamber temperatures. Unlike engineering filaments such as nylon or polycarbonate (PC), PEI filament demands significantly more thermal control.

For optimal results, a printer should include:

• A high-temperature nozzle capable of reaching approximately 350–380°C

• A heated build plate capable of 140-160°C

• A heated chamber, ideally capable of reaching around 190°C for optimal layer adhesion and dimensional stability

• Controlled material handling due to moisture sensitivity

ULTEM™ 9085 is commonly printed on industrial systems, including Stratasys-compatible platforms when using specially formulated variants such as TRITON3D PEI 9085. Lower-temperature printers may produce parts, but mechanical performance, Z-strength, and warp control are often compromised.

Proper drying is also critical, as ULTEM™ 9085 is moisture sensitive and must be handled as a high-performance aerospace-grade filament.

3. What are the key mechanical and thermal properties of ULTEM™ 9085?

ULTEM™ 9085 is a high-performance PEI 3D printing filament engineered for aerospace, automotive, and industrial manufacturing. Its core mechanical and thermal properties include:

• Tensile strength: ~54 MPa

• Tensile modulus: ~2,500 MPa

• Flexural strength: ~90 MPa

• Flexural modulus: ~2,170 MPa

• Heat deflection temperature (HDT): ~158°C

In addition to these mechanical properties, ULTEM™ 9085 provides inherent flame retardancy and strong chemical resistance to hydrocarbons, automotive fluids, and cleaning agents. Its ability to maintain structural integrity at elevated temperatures while meeting strict aerospace flame requirements makes it one of the most widely used PEI filaments in high-temperature 3D printing.

Together, these characteristics position ULTEM™ 9085 as a production-grade additive manufacturing material rather than a prototyping polymer.