What are the key properties of ULTEM 9085?

ULTEM 9085 combines a high strength-to-weight ratio with inherent flame retardancy. Stratasys ULTEM 9085 is UL 94 V-0 on its UL Blue Card, has flame, smoke and toxicity performance tested to aerospace and rail standards, a glass transition temperature of 177 °C, a heat deflection temperature of 170 °C at 1.82 MPa and a tensile yield strength of 69 MPa along the layers, which suits aerospace, rail and automotive applications.

How is ULTEM 9085 used in 3D printing?

ULTEM 9085 is printed by Fused Deposition Modeling (FDM) on Stratasys Fortus systems, with layers from 0.254 to 0.330 mm, parts up to 914 × 610 × 914 mm and breakaway supports. It is used for aircraft cabin components and ducting, avionics enclosures, rail interior parts and engine-bay brackets.

What are the common applications of ULTEM 9085?

ULTEM 9085 is used across aerospace, rail and transit, automotive, military and defense, electronics and manufacturing for aircraft interior panels and ducting, controller enclosures and wire management, rail and bus interior parts, high-temperature jigs and fixtures, and electrical insulation components.

Is ULTEM 9085 certified to FAR 25.853?

Stratasys has tested ULTEM 9085 to 14 CFR 25.853 (FAR 25.853), including vertical burn and heat release, and to the Boeing BSS 7238 and 7239 and Airbus AITM smoke and toxicity methods. Stratasys states the tests show compliance with the tested standard, not certification, so the aircraft program qualifies the finished part with that supplier data as its starting point. Triton PEI 9085 has no published FAR 25.853, smoke or toxicity results.

What are the advantages of using ULTEM 9085?

ULTEM 9085 gives a high strength-to-weight ratio, inherent flame retardancy and electrical insulation, and resists petroleum fuels, hydrocarbons and alcohols. Stratasys ULTEM 9085 has volume resistivity above 6.89 × 10¹⁵ Ω·cm, shows low outgassing in ASTM E595 testing (TML 0.33 to 0.37%, CVCM 0.02% or less) for space applications, and is practically unchanged after 1,000 hours of UV exposure.

What is the difference between Stratasys ULTEM 9085 and Triton PEI 9085?

Both are ULTEM 9085 PEI filaments for Stratasys Fortus systems, for flame-resistant, high-heat parts. Stratasys ULTEM 9085 is tested on edge and upright to ASTM standards, is UL 94 V-0 on its UL Blue Card, and has published results for 14 CFR 25.853, Boeing and Airbus smoke and toxicity methods, EN 45545-2, NFPA 130, UN ECE R118 and ASTM E595 outgassing. Triton PEI 9085 is made from ULTEM 9085 resin and is inherently flame-resistant with low smoke evolution; its values come from flat (XY) samples tested to ISO standards, so they are not directly comparable with the Stratasys ASTM values. The UL 94 listing and the aircraft, rail and bus fire results belong to Stratasys ULTEM 9085; Triton PEI 9085 has no published flammability, food-contact or biocompatibility rating. Each grade's datasheet lists its full test data.

Are there any limitations to ULTEM 9085?

ULTEM 9085 is anisotropic: upright Stratasys ULTEM 9085 parts break at 39.4 MPa against 68.1 MPa along the layers, so orientation matters. It needs a heated chamber and breakaway support, costs more than standard engineering thermoplastics, needs dry storage, and is offered in natural amber and black. Halogenated hydrocarbons and phenols attack Stratasys ULTEM 9085, and neither grade has published biocompatibility data.

Can ULTEM 9085 be used for automotive under-hood parts?

Yes, for brackets, sensor mounts, air intake components and battery enclosures near heat. Stratasys ULTEM 9085 keeps 87% of its room-temperature strength at 104 °C and 70% at 132 °C, and is rated excellent against petroleum fuels and good against motor oil and coolant. Its resistance to brake and transmission fluid is limited, and 170 °C is a short-term deflection point, not a continuous service temperature.

Fused Deposition Modeling ULTEM 9085 (Triton PEI 9085) For Flame-Resistant, High-Temperature Parts

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Large Build Volume

Up to 914 × 610 × 914 mm

FDM material

ULTEM 9085 overview

ULTEM 9085 is a strong, lightweight, flame-retardant plastic for finished aircraft, rail and enclosure parts, made by Fused Deposition Modeling (FDM) 3D printing with no tooling. Stratasys ULTEM 9085 has been tested to aircraft and railway standards for flame, smoke and toxic fumes, so printed ducts, panels and brackets can replace machined parts in cabins and trains. It stays stable in hot service, holds up to fuels, alcohols and water-based fluids, and is tough enough to survive handling during installation. Choose it for cabin interiors, avionics and power enclosures, rail and bus interior parts, and lightweight replacements for machined brackets and fittings. Triton PEI 9085 is 3DXTECH's ULTEM 9085 PEI for Stratasys printers, for enclosures, brackets and fixtures in hot service. It is inherently flame-resistant with low smoke evolution, keeps its strength and stiffness at elevated temperatures, and holds its dimensions with low heat creep.

Also available in Stratasys ULTEM 9085.

How ULTEM 9085 is manufactured

ULTEM 9085 is manufactured using Fused Deposition Modeling (FDM) on Stratasys Fortus production systems, which build parts layer by layer from PEI filament in a heated chamber, with no tooling. Forge Labs' Fortus 900mc systems with precise thermal control ensure consistent mechanical properties across large builds, critical for aerospace tooling and production parts. Breakaway supports carry overhangs and internal features during the build, so parts from air ducts to structural brackets print in their final shape.

Build volume: 914 × 610 × 914 mm
Lead time: 2-4 business days
Layer height: 0.254-0.330 mm

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Industry applications

Industry applications for ULTEM 9085

ULTEM 9085 combines light weight and high strength with inherent flame retardancy, and Stratasys ULTEM 9085 adds flame, smoke and toxicity (FST) performance tested to aerospace standards, making it a go-to FDM thermoplastic for aircraft interiors.

Its high glass transition temperature and broad resistance to petroleum fuels, hydrocarbons, alcohols and aqueous solutions keep parts stable in hot, fluid-exposed service. This durability, combined with inherent flame retardancy (UL 94 V-0 listed in Stratasys ULTEM 9085), allows ULTEM 9085 to replace traditionally machined components in both cabin and out-of-cabin applications.

From rapid prototyping to production runs, teams rely on ULTEM 9085 to maintain tight tolerances while reducing assembly complexity through consolidated part designs. It balances strength and flexibility, unlike the more rigid ULTEM 1010, so housings, brackets and clips survive handling during installation and servicing.

Beyond aircraft and rail interiors, underwater vehicle builders choose it for interior parts that must be flame retardant, defense teams for ruggedized housings, and production lines for high-temperature jigs, fixtures and semiconductor tooling. Its low dielectric constant and electrical insulation suit RF-transparent radomes, antenna housings and PCB carriers, and its low thermal conductivity suits thermal insulation parts.

All industries

Aerospace
Aircraft Systems & Avionics Enclosures
Black controller enclosures with cable guides, inspected and shipped in about two and a half weeks.
Aircraft Interiors
Cabin Ducting, Panels & Brackets
Ducts, panels and brackets in Stratasys ULTEM 9085, which meets 14 CFR 25.853, with large ducts printed in one piece.
Power Generation
Engine Intake Fittings Replacing Aluminium
An intake fitting drawn in 6061-T6 aluminium, made in black ULTEM 9085 at solid infill.
Clean Tech
Fuel Cell Brackets & Power Enclosures
Flame-rated fuel cell brackets in UL 94 V-0 listed Stratasys ULTEM 9085.
Rail & Transit
Rail & Bus Interior Parts
Interior parts for underground and mainline rail, in Stratasys ULTEM 9085 reaching EN 45545-2 HL3 at 10 mm.

Black ULTEM 9085 FDM electronics enclosure and lid with threaded inserts and internal cable guides

Aerospace

Aircraft Systems & Avionics Enclosures

Aircraft systems makers use ULTEM 9085 for controller enclosures, wire management and instrument brackets, where heat resistance, low weight and electrical insulation matter together. On black enclosures for aircraft water-system controllers, the drawing fixed the material, the FDM process and the build direction, internal cable guides were refined through print trials, and first article inspection checked the mounting features. Samples shipped in about two and a half working weeks, with orientation and print settings recorded for repeat orders.

Avionics and controller enclosures
Wire management and cable guides
Instrument and equipment brackets

Read the aircraft enclosure case study

Large natural ULTEM 9085 duct lifted out of an FDM build chamber

Aircraft Interiors

Cabin Ducting, Panels & Brackets

Cabin and environmental control teams use ULTEM 9085 for air ducts, interior panels and brackets that must meet aircraft fire rules. Stratasys ULTEM 9085 meets 14 CFR 25.853, including 60-second and 12-second vertical burns and heat release, and its smoke density of 4 to 15 in Boeing BSS 7238 testing is far below the FAA limit of 200, with low toxic gas emissions. Large ducts print in one piece, so assemblies that once needed several moulded or bonded sections become a single part.

Interior panels and ducting systems
Environmental control system components
Cabin brackets and trim

Explore aerospace

Natural ULTEM 9085 four-runner intake manifold printed by FDM, in front of Stratasys production printers

Power Generation

Engine Intake Fittings Replacing Aluminium

Power generation developers use ULTEM 9085 where a low-load metal part can become a lighter polymer one. On a set of prototype engine parts, an intake fitting drawn in 6061-T6 aluminium was made in black ULTEM 9085 by FDM at solid infill. Swaps like this are checked for strength across the layers and heat near the engine, where Stratasys ULTEM 9085 has a heat deflection temperature of 170 °C at 1.82 MPa.

Intake fittings and manifolds
Engine-bay brackets and covers
Machined-part replacements

Read the engine parts case study

Gold ULTEM 9085 FDM Y-fitting with a black camlock coupling and stainless steel lever

Clean Tech

Fuel Cell Brackets & Power Enclosures

A fuel cell maker orders flame-rated ULTEM 9085 brackets, and the same material suits power distribution enclosures and fluid-line fittings in energy equipment. Stratasys ULTEM 9085 is UL 94 V-0 listed at walls as thin as 0.508 mm for horizontal builds and 1.016 mm for vertical builds at 0.254 mm layers, so brackets and covers designed to those walls are flame retardant with no added coating.

Flame-rated fuel cell brackets
Power distribution enclosures
Fluid and air-line fittings

Explore energy and clean tech

Large amber ULTEM 9085 panel part on the build sheet inside a Stratasys FDM chamber

Rail & Transit

Rail & Bus Interior Parts

Rail and bus builders use ULTEM 9085 for interior panels, ventilation grilles and junction boxes, where low smoke and toxicity matter most in tunnels. Stratasys ULTEM 9085 reaches EN 45545-2 HL2 at 1 mm and HL3 at 10 mm for requirements R1, R6 and R7, and its certified grade has a flame spread index of 0 in the ASTM E162 test NFPA 130 calls for and does not ignite in UN ECE Regulation 118 bus tests.

Interior paneling and ventilation grilles
Junction boxes and emergency equipment housings
Seat components and armrests

Explore automotive and transit

Performance data

Technical performance for ULTEM 9085

Each value is tested to the standard listed with it. Compare the other grade or another material side by side.

Compare with another grade or material

Mechanical performance

Mechanical properties

Triton PEI 9085 brings the strength and stiffness of ULTEM 9085 PEI to enclosures, brackets and fixtures, and keeps its strength and modulus at elevated temperatures.

Triton PEI 9085 values come from flat (XY) samples printed on a Fortus 400mc at 0.33 mm layers with solid infill and tested to ISO standards, so they are not directly comparable with the ASTM values for Stratasys ULTEM 9085, which are measured on edge and upright.

PropertyPEI 9085

Tensile Strength at Break (XY)ISO 527: 55 MPa
Tensile Modulus (XY)ISO 527: 2200 MPa
Elongation at Break (XY)ISO 527: 3 %
Flexural Strength (XY)ISO 178: 91 MPa
Flexural Modulus (XY)ISO 178: 2170 MPa

Material makeup

Physical properties

Triton PEI 9085 is specified by its density, measured to ISO 1183 on printed samples. Low heat creep and a very low, uniform coefficient of thermal expansion keep parts dimensionally stable.

PropertyPEI 9085

DensityISO 1183: 1.34 g/cm³

Heat performance

Thermal properties

Glass transition is measured by DSC and heat deflection at 0.45 MPa on flat samples to ISO 75. The high glass transition temperature and low heat creep keep parts stable in hot service.

PropertyPEI 9085

Glass Transition TemperatureDSC: 186 °C
HDT @ 0.45 MPa / 66 psi (XY)ISO 75: 158 °C

Functional performance

Electrical properties

The surface resistance of Triton PEI 9085 confirms it as an electrical insulator for housings, connectors and insulating features.

PropertyPEI 9085

Surface ResistanceIEC 60093: > 10¹³ Ω/sq

Compatibility data

Chemical properties

Triton PEI 9085 resists automotive fluids, alcohols and aqueous solutions. It has no chemical ratings of its own; the table shows the Stratasys ULTEM 9085 class ratings as a guide to the resin.

Chemical ratings are screening guidance; confirm them with application-specific testing before production release.

ChemicalRating

Petroleum fuels: Excellent
Windshield washer fluid: Excellent
Weak bases (pH 8–10): Excellent
Deionized water: Excellent
Aliphatic hydrocarbons: Good
Aromatic hydrocarbons: Good
Alcohol / ethanol: Good
Esters: Good
Motor oil: Good
Petroleum greases: Good
Silicone greases and oils: Good
Antifreeze / engine coolant: Good
Weak acids (pH 3–6): Good
Strong bases (pH > 10): Good
Ketones (MEK, acetone): Limited
Strong acids (pH < 3): Limited
Transmission fluid: Limited
Brake fluid: Limited
Halogenated hydrocarbons (CFCs): Poor
Phenols: Poor

Related materials

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Resources

Datasheets and design resources

Datasheets, design guidance and supplier documentation for ULTEM 9085.

Download center

Access the most recent datasheet and supporting documentation maintained by our engineering team.

Triton PEI 9085 datasheet

Design guidelines

Explore printable geometry recommendations, wall thickness tips, and finishing playbooks for FDM.

View FDM design guide

Technician checking a Y-shaped part inside a Stratasys FDM production printer

Advanced Manufacturing

Built with Precision FDM Technology

ULTEM 9085 is manufactured using Fused Deposition Modeling (FDM) technology, offering reliable performance for functional prototypes and end-use parts. Qualified material profiles give strong layer adhesion on every build.

Tolerance: ±0.25 mm or ±0.3%, whichever is greater
Production capacity: Multiple parts and assemblies in each build
Quality control: In-process monitoring and batch traceability for consistent part quality and material properties
Colours & finishes: Natural tan or black; support removal, sanding, bead blasting, painting and machining

Learn more about FDM technology

Frequently Asked Questions

Frequently asked questions about ULTEM 9085

Can't find the answer you're looking for? Reach out to our customer support team.

: ULTEM 9085 combines a high strength-to-weight ratio with inherent flame retardancy. Stratasys ULTEM 9085 is UL 94 V-0 on its UL Blue Card, has flame, smoke and toxicity performance tested to aerospace and rail standards, a glass transition temperature of 177 °C, a heat deflection temperature of 170 °C at 1.82 MPa and a tensile yield strength of 69 MPa along the layers, which suits aerospace, rail and automotive applications.
: ULTEM 9085 is printed by Fused Deposition Modeling (FDM) on Stratasys Fortus systems, with layers from 0.254 to 0.330 mm, parts up to 914 × 610 × 914 mm and breakaway supports. It is used for aircraft cabin components and ducting, avionics enclosures, rail interior parts and engine-bay brackets.
: ULTEM 9085 is used across aerospace, rail and transit, automotive, military and defense, electronics and manufacturing for aircraft interior panels and ducting, controller enclosures and wire management, rail and bus interior parts, high-temperature jigs and fixtures, and electrical insulation components.
: Stratasys has tested ULTEM 9085 to 14 CFR 25.853 (FAR 25.853), including vertical burn and heat release, and to the Boeing BSS 7238 and 7239 and Airbus AITM smoke and toxicity methods. Stratasys states the tests show compliance with the tested standard, not certification, so the aircraft program qualifies the finished part with that supplier data as its starting point. Triton PEI 9085 has no published FAR 25.853, smoke or toxicity results.
: ULTEM 9085 gives a high strength-to-weight ratio, inherent flame retardancy and electrical insulation, and resists petroleum fuels, hydrocarbons and alcohols. Stratasys ULTEM 9085 has volume resistivity above 6.89 × 10¹⁵ Ω·cm, shows low outgassing in ASTM E595 testing (TML 0.33 to 0.37%, CVCM 0.02% or less) for space applications, and is practically unchanged after 1,000 hours of UV exposure.
: Both are ULTEM 9085 PEI filaments for Stratasys Fortus systems, for flame-resistant, high-heat parts. Stratasys ULTEM 9085 is tested on edge and upright to ASTM standards, is UL 94 V-0 on its UL Blue Card, and has published results for 14 CFR 25.853, Boeing and Airbus smoke and toxicity methods, EN 45545-2, NFPA 130, UN ECE R118 and ASTM E595 outgassing. Triton PEI 9085 is made from ULTEM 9085 resin and is inherently flame-resistant with low smoke evolution; its values come from flat (XY) samples tested to ISO standards, so they are not directly comparable with the Stratasys ASTM values. The UL 94 listing and the aircraft, rail and bus fire results belong to Stratasys ULTEM 9085; Triton PEI 9085 has no published flammability, food-contact or biocompatibility rating. Each grade's datasheet lists its full test data.
: ULTEM 9085 is anisotropic: upright Stratasys ULTEM 9085 parts break at 39.4 MPa against 68.1 MPa along the layers, so orientation matters. It needs a heated chamber and breakaway support, costs more than standard engineering thermoplastics, needs dry storage, and is offered in natural amber and black. Halogenated hydrocarbons and phenols attack Stratasys ULTEM 9085, and neither grade has published biocompatibility data.
: Yes, for brackets, sensor mounts, air intake components and battery enclosures near heat. Stratasys ULTEM 9085 keeps 87% of its room-temperature strength at 104 °C and 70% at 132 °C, and is rated excellent against petroleum fuels and good against motor oil and coolant. Its resistance to brake and transmission fluid is limited, and 170 °C is a short-term deflection point, not a continuous service temperature.

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