FIBREX PEI+GF30 • 3DXTECH • REV1 TECH
3DXTech FibreX™ PEI+GF30 30% Glass Fiber Ultem PEI — 217°C Tg · UL 94 V-0 · Electrically Insulating · Made in USA
30% Glass Fiber Ultem PEI — 217°C Tg · UL 94 V-0 · Electrically Insulating · Made in USA
3DXTech’s FibreX PEI+GF30 combines 30% high-modulus glass fiber with Ultem PEI resin — the highest fiber loading in the FibreX line. With a 217°C glass transition temperature, UL 94 V-0 flame rating, and >10¹³ Ω/sq surface resistance, GF30 delivers structural stiffness and inherent flame retardance for aerospace, electrical, and industrial applications. Electrically insulating like all glass fiber grades. Made in Grand Rapids, Michigan.
250g in stock. 500g & 1kg contact for availability. Contact Rev1 to confirm.
WHY FIBREX PEI+GF30
217°C Tg. UL 94 V-0. Highest GF Loading in the FibreX Line.
FibreX™ PEI+GF30 is 3DXTech’s 30% glass fiber reinforced Ultem PEI filament — the highest fiber loading in the FibreX line. Ultem PEI delivers an inherently UL 94 V-0 flame rating without additives, a 217°C glass transition temperature, and surface resistance >10¹³ Ω/sq. The GF30 loading maximizes stiffness (8,790 MPa tensile modulus) while maintaining electrical insulation. Natural color enables visual inspectability. For aerospace, electrical insulation, and high-temperature structural applications.
Inherently UL 94 V-0 (No Additives)
Ultem PEI resin is inherently flame retardant — UL 94 V-0 rating without flame retardant additives. Critical for aerospace and transportation programs requiring self-extinguishing performance from the base material, not from additives that can leach or degrade.
Electrically Insulating (Unlike CF Grades)
Surface resistance >10¹³ Ω/sq. Glass fiber reinforcement preserves Ultem PEI’s electrical insulating properties — CF grades reduce resistivity. Critical for high-voltage hardware, connector components, and ESD-sensitive tooling.
217°C Tg — High Heat Amorphous PEI
Ultem PEI (amorphous) has a 217°C glass transition temperature — one of the highest Tg values in the 3DXTech filament catalog. Suitable for sustained high-temperature service above 200°C. GF30 reinforcement further extends dimensional stability at elevated temperatures.
Made in USA
Extruded and wound in-house at 3DXTech’s Grand Rapids, MI facility under ISO 9001:2015 certification. 30% glass fiber compounded with Ultem PEI resin, with full lot traceability throughout filament fabrication. Natural color for visual inspection.
PRINTING WITH FIBREX PEI+GF30
PEI+GF30 — High-Temperature Amorphous PEI with Maximum Glass Fiber Loading
FibreX PEI+GF30 requires a hardened steel nozzle — glass fiber is abrasive. Process requirements are similar to ThermaX PEI 1010: industrial hardware, 400°C-capable hot end, and heated enclosure. Dry at 120°C for 4 hours before every session. Natural color allows part inspection without surface treatment.
- Extruder Temp 380–410°C — all-metal hot end required
- Bed Temp 130–140°C — PEI or garolite build surface
- Chamber Temp 70–140°C recommended — heated enclosure strongly recommended
- Nozzle Hardened steel ≥0.4mm — MANDATORY. Glass fiber is abrasive and will wear brass nozzles.
- Drying 120°C / 4 hr minimum before every print session
- ⚠ Nozzle Warning Hardened nozzle is non-negotiable. 30% glass fiber is more abrasive than standard GF loadings — a standard brass nozzle will show rapid wear. Use hardened steel, ruby, or sapphire nozzle. 0.4mm minimum diameter — small nozzles are more prone to GF bridging.
THERMAL DATA
217°C Tg — High-Performance Amorphous PEI with Glass Fiber Reinforcement
Four thermal milestones defining FibreX™ PEI+GF30’s operating envelope — verified against 3DXTech FibreX GF30 Ultem PEI TDS v1.
Tg of the Ultem PEI matrix — one of the highest Tg values in the 3DXTech filament catalog. Amorphous PEI maintains dimensional stability from Tg. GF30 reinforcement further extends stiffness above Tg. Higher Tg than ThermaX PEI 1010 unfilled grade.
HDT at 0.45 MPa. GF30 loading elevates the HDT significantly above unfilled PEI, enabling sustained load-bearing service at temperatures approaching the Tg. Suitable for industrial process environments well above 180°C.
Ultem PEI is inherently UL 94 V-0 — self-extinguishing without flame retardant additives. No additive migration risk. Required rating for many aerospace, rail, and transportation interior programs.
Required before every session. Consistent drying at 120°C ensures print quality at 380–410°C extrusion temperatures. Pre-drying is best practice for all PEI-family filaments.
ELECTRICAL INSULATION & CHEMICAL RESISTANCE
Electrical Insulation Plus UL 94 V-0 Flame Performance
FibreX™ PEI+GF30’s glass fiber reinforcement preserves Ultem PEI’s excellent electrical insulating properties — surface resistance >10¹³ Ω/sq. Carbon fiber grades reduce resistivity dramatically. GF30 delivers both high stiffness and electrical insulation, combined with the inherent UL 94 V-0 flame rating of the Ultem PEI base resin. Note: PEI is not as broadly solvent-resistant as PEEK — avoid aromatic solvents and strong bases. Consult the TDS for specific compatibility.
Consult 3DXTech FibreX GF30 Ultem PEI TDS v1 for complete chemical compatibility and electrical property data. PEI is susceptible to aromatic solvents and strong bases — verify compatibility before fluid-contact applications.
SPECIFICATIONS
FibreX™ PEI+GF30 — Full Technical Data
Source: 3DXTech FibreX GF30 Ultem PEI TDS v1. ISO-standard test specimens. 1.75mm natural filament.
Material Properties
| Polymer | Ultem PEI + 30% Glass Fiber (GF30) |
| Diameter | 1.75mm |
| Color | Natural |
| Glass Transition (Tg) | 217°C |
| HDT (0.45 MPa, ISO 75) | 212°C |
| Flame Rating | UL 94 V-0 (inherent, no additives) |
| Surface Resistance | >10¹³ Ω/sq (electrically insulating) |
| Tensile Strength | 145 MPa (ISO 527) |
| Tensile Modulus | 8,790 MPa (ISO 527) |
| Flexural Strength | 178 MPa (ISO 178) |
| Flexural Modulus | 8,560 MPa (ISO 178) |
| Tensile Elongation | 2% |
| Density | 1.51 g/cm³ (ISO 1183) |
Print Parameters
| Extruder Temp | 380–410°C |
| Bed Temp | 130–140°C |
| Chamber Temp | 70–140°C recommended |
| Drying Protocol | 120°C / 4 hr minimum |
| Nozzle | Hardened steel ≥0.4mm (MANDATORY) |
| Hot End Requirement | All-metal, rated ≥410°C |
Availability
| Spool Sizes (Available) | 250g (in stock) |
| 500g / 1kg | Contact for availability |
| 250g Price | $125 |
| Lead Time | Varies — contact Rev1 to confirm |
| Quality Standard | ISO 9001:2015 Certified |
| Origin | Grand Rapids, MI, USA |
SPOOL SELECTION
250g In Stock. 500g & 1kg Contact for Availability.
FibreX™ PEI+GF30 is available in Natural (1.75mm). 250g is stocked. 500g and 1kg — contact Rev1 to inquire about availability or lead time.
- Reel #1 — 152mm dia., 41mm wide
- Entry / Qualification
- Ships from stock
- Reel #2–#7 — 198mm dia.
- Contact Rev1 to inquire
- Reel #4 — 198mm dia., 72mm wide
- Contact Rev1 to inquire
PRINT QUALITY
Production-Grade Output on the Right Equipment
FibreX™ PEI+GF30 produces parts with fine surface detail and strong interlayer adhesion when printed on a properly configured industrial platform. Natural color enables optical inspection of printed parts without surface treatment.
COMPATIBLE PLATFORMS
Requires an Industrial-Grade 3D Printer
FibreX PEI+GF30 demands an all-metal hot end rated to 410°C+, a heated enclosure, AND a hardened steel nozzle (GF is abrasive). Any open-platform printer meeting these requirements can run PEI+GF30. Hot end requirement is similar to ThermaX PEI 1010 — 380–410°C.
CreatBot F160-PEEK
Purpose-built high-temperature platform with dual all-metal hot ends and integrated chamber heating. PEI+GF30 compatible. Rev1’s top recommendation for first-time high-temp PEI adopters.
Rev1 RecommendedCreatBot PEEK-300
300mm build volume, 420°C hot end rating, 200°C heated chamber. PEI+GF30 compatible. Production-oriented platform for larger electrically insulating part geometries.
Rev1 RecommendedCreatBot F430
Quad-nozzle large-format industrial printer with multi-material capability. PEI+GF30 compatible. Supports high-temp materials plus support materials for complex precision tooling geometries.
Rev1 RecommendedAny Open-Platform Printer
Minimum: 410°C+ all-metal hot end • 130–140°C heated bed • 70–140°C enclosure • hardened steel nozzle ≥0.4mm (MANDATORY for GF).
WHERE IT WORKS
Where GF-Reinforced Ultem PEI Outperforms Every Other Option
When you need high Tg, UL 94 V-0 flame performance, and electrical insulation in one material — FibreX PEI+GF30 is the answer. CF grades are unsuitable wherever resistivity matters.
Aerospace & Transportation Interiors
Structural brackets, interior fixtures, and ducting requiring UL 94 V-0 flame rating from the base material — not from additives. PEI’s inherent flame resistance meets stringent FAA/aviation and rail interior requirements.
Electrical Insulation
High-voltage spacers, terminal blocks, and connector housings requiring combined structural stiffness (8,790 MPa tensile modulus) and high surface resistance (>10¹³ Ω/sq). CF grades are conductive and disqualified.
ESD-Sensitive Semiconductor Tooling
Wafer handling equipment, process tooling, and chamber components where ESD grounding is undesirable. GF30’s electrical insulation prevents charge transfer that CF-filled grades cannot.
High-Temperature Structural Components
Jigs, fixtures, and end-use structural parts requiring sustained service above 180°C under load. 212°C HDT with GF30 reinforcement withstands industrial process environments without dimensional drift.
Medical & Industrial Fixtures
Sterilizable fixtures and end-use device components requiring elevated stiffness, 217°C Tg, and inherent flame resistance. Natural color simplifies visual inspection and part traceability.
Defense & Industrial
Components requiring combined high stiffness, electrical insulation, UL 94 V-0 compliance, and domestic manufacture under ISO 9001 certification. Suitable for defense supply chains requiring traceable materials.
MATERIAL CARE
Moisture Is the Enemy. A Proper Protocol Eliminates It.
PEI+GF30 requires consistent drying before printing at 380–410°C. The Ultem PEI matrix absorbs moisture despite glass fiber reinforcement. Follow this protocol every session to maintain print quality and part properties.
Dry Before Every Session
120°C minimum / 4 hours minimum. No exceptions — even a sealed spool that has been open for a few days benefits from a fresh drying cycle before printing.
Print From the Dryer
For best results, print directly from a heated dry-box or dryer system. Ambient humidity will re-absorb into the filament during extended print runs at production temperatures.
Store Sealed With Desiccant
Return unused filament to an airtight bag or container with fresh desiccant immediately after printing. Long-term storage in original sealed packaging is acceptable.
Recognize Wet Filament Symptoms
Popping or crackling during extrusion, rough surface texture, reduced layer adhesion, and visible bubbling in the melt are signs of moisture contamination. Re-dry and restart.
HOW IT COMPARES
FibreX™ PEI+GF30 vs. Commonly Evaluated Alternatives
Buyers evaluating FibreX PEI+GF30 typically compare against ThermaX PEI 1010 (unfilled) for a ductile PEI option, FibreX PEEK+GF20 for a higher-HDT GF alternative, and Stratasys GF PEI for a platform-locked option.
3DXTech / Rev1 Tech
3DXTech (unfilled)
3DXTech
Stratasys
3DXTECH QUALITY
Manufactured in Michigan. Certified to ISO 9001:2015.
Every spool of FibreX™ PEI+GF30 is produced in-house at 3DXTech’s Grand Rapids, MI facility under ISO 9001:2015 certification. 30% high-modulus glass fiber compounded with Ultem PEI resin, with full lot traceability throughout filament fabrication.
ISO 9001:2015 Certified
Production under a certified quality management system. Lot traceability and process controls throughout filament fabrication. Suitable for aerospace, electrical, and precision tooling supply chains.
Made in Grand Rapids, MI
Filament extruded and wound in-house at 3DXTech’s Michigan facility. Direct factory quality control — not overseas commodity production. Natural color for visual inspection and traceability.
Technical Data Sheet Available
Full processing parameters, mechanical properties, electrical properties, and chemical resistance data published in the FibreX™ GF30 Ultem PEI TDS v1. Available for download below.
RESOURCES
Downloads & Technical Support
Everything you need to qualify and print FibreX™ PEI+GF30 with confidence.
WHY REV1 TECH
Authorized 3DXTech Reseller. Industrial AM Specialists.
Rev1 Technologies is an authorized 3DXTech reseller headquartered in Auburn Hills, MI, with direct technical expertise in high-performance FFF materials and the printers that run them.
Authorized Reseller
Every spool ships direct from the authorized channel. MAP pricing guaranteed. Single-channel license compliance — not a grey-market distributor.
Platform Expertise
Rev1 carries the industrial printers validated for high-temperature PEI. If you need guidance on which platform to match with FibreX PEI+GF30, our team has run them.
Pre-Sales Technical Support
Questions about print settings, printer selection, or qualifying PEI+GF30 for aerospace, electrical insulation, or high-temperature structural applications? Contact Rev1 before you order — that conversation is free.
FREQUENTLY ASKED
FibreX™ PEI+GF30 — Buyer Questions Answered
What is FibreX™ PEI+GF30?
FibreX™ PEI+GF30 is 3DXTech’s 30% high-modulus chopped glass fiber reinforced Ultem PEI filament. Available in Natural (1.75mm), it delivers 8,790 MPa tensile modulus, a 217°C glass transition temperature, UL 94 V-0 inherent flame rating, and surface resistance >10¹³ Ω/sq for electrical insulation applications. A hardened steel nozzle is mandatory — GF reinforcement is abrasive and will wear brass nozzles.
What temperatures does FibreX™ PEI+GF30 require?
FibreX™ PEI+GF30 requires an extruder temperature of 380–410°C and a bed temperature of 130–140°C. A heated enclosure at 70–140°C is strongly recommended. Dry at 120°C for 4 hours minimum before every print session. All-metal hot end rated to 410°C+ is required.
Why does FibreX™ PEI+GF30 need a hardened steel nozzle?
Glass fiber is abrasive. A standard brass nozzle will show measurable wear against GF filament — and at 30% loading, the wear rate is significant. Hardened steel, ruby-tipped, or sapphire nozzles all work. 0.4mm minimum diameter — smaller nozzles are more prone to GF bridging and clogging. The hardened nozzle requirement applies regardless of fiber type (CF or GF).
Why choose PEI+GF30 over unfilled ThermaX PEI 1010?
GF30 adds three key advantages over unfilled PEI 1010: (1) Stiffness — 8,790 MPa vs. 3,100 MPa tensile modulus for structural rigidity under load. (2) HDT — 212°C vs. ~180°C for sustained load-bearing at higher temperatures. (3) Higher dimensional stability for tight-tolerance parts. Both retain UL 94 V-0 and electrical insulation. Unfilled PEI 1010 is better where ductility and impact resistance matter. GF30 wins for stiffness, dimensional stability, and elevated HDT.
What applications use FibreX™ PEI+GF30?
FibreX™ PEI+GF30 is used in aerospace and transportation interior structural components (UL 94 V-0 required), high-voltage electrical insulators and spacers, ESD-sensitive semiconductor tooling, precision jigs and fixtures requiring 212°C+ HDT, medical sterilizable tooling, and defense supply chain components requiring ISO 9001 certified domestic manufacture.
Is FibreX™ PEI+GF30 chemically resistant?
PEI+GF30 is resistant to hydrocarbons, automotive fluids, dilute acids, and alcohols. However, Ultem PEI is susceptible to aromatic solvents (e.g., methylene chloride, toluene) and concentrated bases — this is different from PEEK which has broader solvent resistance. Always consult the FibreX GF30 Ultem PEI TDS v1 and test in your specific chemical environment before production use.
How does FibreX™ PEI+GF30 compare to Stratasys GF PEI?
Both use glass fiber reinforced PEI with similar UL 94 V-0 and electrical insulation properties. Stratasys GF PEI is platform-locked to Fortus/F900 series machines. FibreX™ PEI+GF30 runs on any open-material machine with a hardened nozzle and 410°C+ hot end — same material class, fraction of system cost, no platform lock-in. Open-material access simplifies multi-supplier qualification for aerospace and defense programs.
What spool sizes are available and what is in stock?
FibreX™ PEI+GF30 is currently available in 250g ($125) which ships from stock. 500g and 1kg sizes — contact Rev1 to inquire about lead time and availability. All sizes are 1.75mm Natural. 2kg is not a standard offering for this SKU.