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Filament (FDM)

PEEK 3D printing

PEEK (polyether ether ketone) is a semi-crystalline high-performance polymer used where resistance to heat, chemicals and wear is needed. We print it in Brescia with high-temperature FDM, unfilled or filled with carbon or glass fiber.

Price band
€€€€
3 variantsData checked on 13 November 2026
Request a quote Download the data sheets

What it is for

PEEK is used for parts that work under load, in heat and in contact with chemicals at the same time: bushings, seal rings, gears, insulators, pump and valve components, supports near engines, parts that replace metal to save weight. It resists wear, fuels, oils, steam and nearly all solvents.

It is among the most expensive polymers: do not choose it unless the conditions call for it. For chemical resistance alone PPS is often enough; for heat without wear, Ultem; for mechanical duty at moderate temperatures, a carbon-fiber nylon.

Variants compared

PEEK: properties of the variants from the makers' data sheets, one column per variant: PEEK
PropertyPEEKQuote
Mechanical
Tensile strengthISO 527, printed specimen, XY flat100 MPa
Tensile modulusISO 527, printed specimen, XY flat3,720 MPa
Elongation at breakISO 527, printed specimen, XY flat28%
Flexural strengthISO 178, printed specimen, XY flat130 MPa
Flexural modulusISO 178, printed specimen, XY flat2,700 MPa
Thermal
Heat deflection temperature (HDT) at 0.45 MPaISO 75, printed specimen, XY flat140 °C
Glass transition (Tg)DSC143 °C
Physical
DensityISO 11831.3 g/cm³
Fire behavior
Flammability ratingUL 94, base resin, not the printed partV-0 at 1.5 mm
Source
  • 3DXTech, ThermaX PEEK 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026
PEEK: properties of the variants from the makers' data sheets, one column per variant
PropertyPEEKQuotePEEK-CF (10% carbon fiber)QuotePEEK-GF (20% glass fiber)Quote
Mechanical
Tensile strengthISO 527100 MPaprinted specimen, XY flat105 MPaprinted specimen, XY flat, at break105 MPaprinted specimen, XY flat, at break
Tensile modulusISO 527, printed specimen, XY flat3,720 MPa8,100 MPa7,250 MPa
Elongation at breakISO 52728%printed specimen, XY flat3%printed specimen, XY flat, at break2.5%printed specimen, XY flat, at break
Flexural strengthISO 178, printed specimen, XY flat130 MPa136 MPa130 MPa
Flexural modulusISO 178, printed specimen, XY flat2,700 MPa8,300 MPa7,625 MPa
Thermal
Heat deflection temperature (HDT) at 0.45 MPaISO 75, printed specimen, XY flat140 °C265 °C300 °C
Glass transition (Tg)DSC143 °C143 °C143 °C
Physical
DensityISO 11831.3 g/cm³1.39 g/cm³1.44 g/cm³
Fire behavior
Flammability ratingUL 94, base resin, not the printed partV-0 at 1.5 mmon requeston request
Source
  • 3DXTech, ThermaX PEEK 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026
  • 3DXTech, CarbonX Carbon Fiber PEEK 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026
  • 3DXTech, ThermaX PEEK GF20 3D Printing Filament, TDS Rev 1.0, PDFread on 13 November 2026

Typical values from the makers' data sheets, measured on specimens under the conditions stated. They are not guaranteed design values: for a critical application ask us for a test on your part.

Design limits

Build volume
350 × 350 × 450 mm
Minimum wall
3 mm
Dimensional tolerance
±0.6 mm up to 100 mm, ±0.75% above

These are the limits of the process, the same for every variant unless stated. For critical dimensions, talk to us before printing.

Which variant to choose

  • PEEK: unfilled, the most ductile and the toughest. Specimens printed flat: tensile strength 100 MPa, modulus 3720 MPa, elongation at break 28% (ISO 527); heat deflection temperature 140 °C at 0.45 MPa (ISO 75). For seals, bushings and parts that take impacts.
  • PEEK-CF (10% carbon fiber): stiffer and more stable in heat: tensile strength at break 105 MPa, modulus 8100 MPa, elongation at break 3%; heat deflection temperature 265 °C at 0.45 MPa. For brackets and structural parts.
  • PEEK-GF (20% glass fiber): stiff and electrically insulating, with the highest heat deflection temperature of the three: 300 °C at 0.45 MPa; modulus 7250 MPa, elongation at break 2.5%. For insulators and supports in heat.

Data sheets

  • 3DXTech, ThermaX PEEK 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026

    Columns: PEEK

  • 3DXTech, CarbonX Carbon Fiber PEEK 3D Printing Filament, TDS Rev 3.0, PDFread on 13 November 2026

    Columns: PEEK-CF (10% carbon fiber)

  • 3DXTech, ThermaX PEEK GF20 3D Printing Filament, TDS Rev 1.0, PDFread on 13 November 2026

    Columns: PEEK-GF (20% glass fiber)

FAQ

Frequently asked questions

The data sheets report a heat deflection temperature at 0.45 MPa (ISO 75, specimens printed flat) of 140 °C for PEEK, 265 °C for PEEK-CF and 300 °C for PEEK-GF; the glass transition is at 143 °C. The filament maker states 240–260 °C of continuous use on its website: that is not a data-sheet figure.

Above the glass transition, at 143 °C, unfilled PEEK loses stiffness and bends under load: hence the 140 °C of the test. The fibers hold the material up to temperatures closer to melting, and in the same test PEEK-CF and PEEK-GF reach 265 and 300 °C.

In some cases: bushings, insulators, brackets and lightly loaded parts where weight, chemical resistance or electrical insulation matter. With 100–105 MPa of tensile strength on printed specimens (ISO 527), PEEK remains less stiff and less strong than aluminum. Send us geometry and loads and we will tell you whether it makes sense.

We issue no declaration of suitability for medical use or food contact on printed parts, in any material. PEEK is a polymer used in those fields, but suitability depends on grade, process and documentation. If your project has that requirement, write to us before asking for a quote.

Do you have a part to print in PEEK?

Upload the CAD file: we reply within 1 working day with a quote and a recommended material.

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