Strong and heat-resistant, ULTEM 9085 (Selective Deposition FDM), PEI, aerospace-grade, FST-rated

ULTEM 9085 [PEI (FDM)]

Fused Deposition Modeling (FDM)

Material Info

About

ULTEM 9085 is a flame-retardant polyetherimide (PEI) for FDM that combines high strength-to-weight, excellent heat resistance, and FST performance for transportation interiors and demanding industrial use. Ideal when you need production-grade thermoplastic performance straight off the printer.

Color & Finishes

Natrual
Print mode - Solid
Prints fully solid models
Print mode - Custom infill (on request)
Contact Sales

Lightweight or partially filled structures (e.g. 20–50%) available by review

Technology

  • Fused Deposition Modeling (FDM)

Material Properties

Tensile Strength (ASTM D638)
81 MPa
ensile Modulus (ASTM D638)
2400 MPa
Elongation at Break (ASTM D638)
6.0%
Heat Deflection Temp @ 0.455 MPa (ASTM D648)
153°C

Description

Material Highlights
High-performance thermoplastic with exceptional strength-to-weight ratio, high heat resistance, and inherent flame retardancy; ideal for aerospace and transportation.
Optical properties
Amber translucent (not optically clear); limited light transmission.
Moisture resistance
Excellent — low water absorption, maintains stability in humid environments.
Applications
Aerospace components, electrical housings, automotive interiors, functional prototypes, flame-retardant enclosures.

Design Guidelines

Bounding Box

Maximum Bounding Box
914 x 609 x 914 mm
(natural)

Minimum Bounding Box
X + Y + Z ≥ 15 mm

The bounding box is a 3D imaginary outline of a box that encloses the smallest area occupied by your model. Your model must be within the minimum and maximum bounding box sizes. If the size of the model is close to the maximum bounding box, then the printing orientation will be restricted.

Walls

Supported Walls
1.2mm
 
Unsupported Walls
1.5mm

A supported wall is connected at least on two sides of the wall, while an unsupported wall is connected only on one side of the wall. Walls that do not meet the minimum requirements may not survive printing and cleaning processes. Additionally, models may still be rejected based on the wall geometry of the model. Please consider the size of your model and reinforce the walls or add support structures as needed as minimum guidelines will not always be adequate for large models.

Wires

Supported Wires

1.2mm

Unsupported Wires

1.5mm

A wire is a circular, rectangular or even triangular feature that is thinner in its unconnected directions than its length. A supported wire is connected at least on two sides of the model, while an unsupported wire is connected on one side of the model. Wires that do not meet the minimum requirements may not survive printing and cleaning processes. Additionally, models may still be rejected based on the wire geometry of the model. Please consider the size of your model and reinforce the wires or add support structures as needed as minimum guidelines will not always be adequate for large models.

Details

Embossed Details

0.5mm

Engraved Details

0.3mm

For text, the ratio between width and depth, should be 1:1 and sans-serif fonts are preferred for line weight consistency.

Clearance

Minimum

0.30 mm

Clearance is the space between two individual parts in a model. If the space among the individual parts do not meet the minimum clearance, then parts can fuse together or can be difficult to clean. This is important for movable pieces like hinges, gears, etc.

Sprues

Not supported

Sprues are wires that keep two or more parts together. Parts should be connected with a minimum of two sprues each. Please consider the size of your sprues and increase them as needed as minimum guidelines will not always be adequate for large models. If the sprues are within the guidelines and are broken, but there is no damage to your model, we will still ship them as is.

Interlocking & Enclosed Parts

Interlocking
Not supported

Enclosed
Not supported

Multiple Parts

Not supported

Parts in File


1

Accuracy


± 0.3% with a lower limit of ± 0.3 mm

For example: a product with dimensions of 50x50x100 mm can be 0.3 mm or 0.003*100 mm = 0.3 mm bigger or smaller in any direction.

Related Materials

Acrylonitrile Styrene Acrylate
ASA
Application: A high-performance, weather-resistant thermoplastic ideal for outdoor applications.
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Polyethylene Terephthalate Glycol
PETG
Application: Strong, impact-resistant, excellent all-round material that is easy to print, and has a good surface finish
Learn More →

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