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PETG & related polymers · Material guide

Carbon-fibre PET (PET-CF)

Semi-crystalline PET with carbon fibre — a genuinely different material from PETG-CF, reaching 182–205 °C heat deflection but needing an 80 °C dry, a heated chamber and speeds halved to 100…

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Apache 3800 Speaker Grille and Trim shown in the Dylan Kirby Printables listing; reported material: Carbon-fibre PET (PET-CF)
Reported material: Carbon-fibre PET (PET-CF)Apache 3800 Speaker Grille and Trim Printables listing uploaded by Dylan Kirby · CC BY-NC 4.0Source image · Image bytes unchanged; displayed in full. Noncommercial reuse only.
Understand the material

At a glance

Before you print

Setup difficulty
Advanced — enclosure, hardware upgrades, tuning
Nozzle wear
Highly abrasive — standard CF composite
Read conditions and sources ↓
Read the full material overview

Semi-crystalline PET with carbon fibre — a genuinely different material from PETG-CF, reaching 182–205 °C heat deflection but needing an 80 °C dry, a heated chamber and speeds halved to 100 mm/s.

Applications

PET-CF occupies a higher-temperature engineering niche than PETG-CF because the PET matrix can crystallize. Polymaker positions PET-CF17 for automotive, robotics and industrial components where stiffness and thermal stability matter. That makes the category relevant to rigid end-use parts and tooling, provided the material has received the processing needed to obtain the quoted properties.

Annealing is central to that distinction. Polymaker states that it improves heat resistance and stiffness but does not improve impact resistance or layer adhesion; thin features can also deform during the heat treatment. PET-CF remains brittle and direction-dependent, so high in-plane strength should not be read as equivalent strength across layers or reliable flexural-fatigue performance.

  • Automotive, robotics and industrial components ↗

    FDM · Fiberon PET-CF17; annealed thermal properties require annealing · Manufacturer-listed applications

    Polymaker lists these engineering sectors for PET-CF17 and ties the grade to stiffness and dimensional stability. The page describes an intended application class rather than a named qualified component.

Sources
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Representative catalog values. Check the exact grade and its linked conditions before using a setting.

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Properties & source data

63 documented fields

Open a topic to explore the complete data. Each value keeps its original conditions, units and dated sources.

Material & market7 fields
Carbon-fibre PET (PET-CF) — Identity & Market
Property and unitPublished value and conditionsSources and dates
Base polymer / chemistrySemi-crystalline PET reinforced with carbon fibre — a different polymer from PETG-CF, with the glycol modifier removed so the matrix can crystallise
2 sources
Density (g/cm³)1.29 (Bambu Lab) and 1.34 (Fiberon PET-CF17), ISO 1183
2 sources
Typical price (USD/kg)1 kg spools cluster near 45
2 sources
Price range across brands (USD/kg)26–50 across brands; ELEGOO 26 in a 5 kg pack, Bambu Lab 45, Fiberon 50
3 sources
Market availability (1–5)Available from several mainstream brands
3 sources
Spool sizes & diameters1.75 mm; 0.5 and 1 kg spools
2 sources
Typical applicationsLoad-bearing parts that must survive above PETG's 70 °C ceiling without moving to PA or PC
2 sources
Print settings10 fields
Carbon-fibre PET (PET-CF) — Printing Parameters
Property and unitPublished value and conditionsSources and dates
Nozzle temperature (°C)260–290 (Bambu Lab)
1 source
Bed temperature (°C)80–100 (Bambu Lab)
1 source
Enclosure / chamber requirement (1–5)Enclosure recommended — Bambu Lab specifies a 45–60 °C chamber
1 source
Recommended chamber temperature (°C)45–60 (Bambu Lab)
1 source
Part cooling fan0–60 % (Bambu Lab)
1 source
Bed surface & adhesion aidTextured PEI, satin or powder-coated sheets; on smooth PEI a glue stick acts as a release agent
2 sources
Maximum volumetric flow (mm³/s; see test conditions) (mm³/s)8 at Bambu Lab's 100 mm/s cap on a 0.4 mm nozzle at 0.2 mm layer — half the speed it allows for PETG-CF
2 sources
Bed-adhesion difficulty (1–5)Needs the right surface or a thin adhesive — the problem is releasing the part, not sticking it
2 sources
Stringing / oozing tendency (1–5)Moderate — retraction tuning needed; Polymaker names stringing as PETG's common quirk
1 source
Overall printing difficulty (1–5)Advanced — enclosure, hardware upgrades, tuning
1 source
Nozzle wear & reliability5 fields
Carbon-fibre PET (PET-CF) — Hardware Wear & Reliability
Property and unitPublished value and conditionsSources and dates
Nozzle hardness required (1–4)Hardened steel required
1 source
Abrasiveness (1–5)Highly abrasive — standard CF composite
1 source
Nozzle clog risk (1–5)Moderate — needs dry filament and a clean nozzle; Prusa lists higher risk of nozzle clogging for carbon-filled composites
1 source
Heat-creep / jam sensitivity (1–5)Slightly sensitive
1 source
Hotend requirementNo special hot-end required
1 source
Moisture & drying7 fields
Carbon-fibre PET (PET-CF) — Moisture Behaviour
Property and unitPublished value and conditionsSources and dates
Moisture absorption (hygroscopicity) (1–5)Moderate — 0.37 % saturated at 25 °C / 55 % RH (Bambu Lab); 0.53 % equilibrium (Fiberon)
2 sources
Equilibrium moisture content at ~50 % RH (%)0.37 saturated at 25 °C / 55 % RH (Bambu Lab); 0.53 equilibrium (Fiberon PET-CF17)
2 sources
Drying temperature & time80 °C for 8–12 h (Bambu Lab) — the longest and hottest dry in the polyester family; Fiberon specifies 100 °C for 10 h
2 sources
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface
1 source
Effect of moisture on strengthBambu Lab publishes its whole mechanical table under the heading "Mechanical Properties (Dry state)" — the quoted figures apply only to dried filament
1 source
Storage requirementSealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials
2 sources
Hydrolysis at melt temperatureThe 80–100 °C dry both suppliers mandate is far above the 55–65 °C used for PETG, consistent with a melt-hydrolysis risk in the semi-crystalline PET matrix; neither publishes a molecular-weight loss figure
2 sources
Strength & mechanical properties12 fields
Carbon-fibre PET (PET-CF) — Mechanical Properties
Property and unitPublished value and conditionsSources and dates
Tensile strength (XY) (MPa)65.9 (Fiberon) to 74 (Bambu Lab) printed XY, ISO 527
2 sources
Young's modulus (MPa)4730 ± 260 (Bambu Lab) and 5481 ± 224 (Fiberon) printed XY, ISO 527
2 sources
Elongation at break (%)2.4 ± 0.5 printed XY, ISO 527 (Fiberon PET-CF17)
1 source
Flexural strength (MPa)109.3 ± 2.0 printed XY, ISO 178 (Fiberon PET-CF17)
1 source
Flexural modulus (MPa)4744 ± 136 printed XY, ISO 178 (Fiberon PET-CF17)
1 source
Charpy impact, notched (kJ/m²)5.1 ± 0.2 printed XY, ISO 179 notched (Fiberon PET-CF17); unnotched 25.1 ± 2.8
1 source
Layer adhesion / Z tensile (MPa)27.9 (Fiberon) and 35 ± 5 (Bambu Lab) printed Z, ISO 527
2 sources
Brittleness (1–5)Very brittle — elongation at break 2.4 % in XY and 0.8 % in Z
1 source
Creep resistance / sustained load (1–5)Good — no creep test found; annealed PET-CF holds a 105 °C HDT at 1.8 MPa and a 4730–5481 MPa modulus against 1500–2311 for PETG
2 sources
Fatigue / repeated-flex resistance (1–5)Below average — no S-N curve; elongation at break is 2.4 % in XY and 0.8 % in Z, against 5.2–9.3 % for unfilled PETG
1 source
Elasticity / flexibility (1–5)Rigid
1 source
Z strength as % of XY (%)42 (Fiberon) to 47 (Bambu Lab), printed
2 sources
Heat & temperature6 fields
Carbon-fibre PET (PET-CF) — Thermal Properties
Property and unitPublished value and conditionsSources and dates
HDT at 0.45 MPa (°C)147.5 (Fiberon) and 205 (Bambu Lab), ISO 75 at 0.45 MPa
2 sources
HDT at 1.8 MPa (°C)105 (Fiberon) and 182 (Bambu Lab), ISO 75 at 1.8 MPa
2 sources
Glass transition (Tg) (°C)75 (Bambu Lab) and 79.3 (Fiberon), DSC
2 sources
Melting point / Vicat (°C)241.3 (Fiberon) and 250 (Bambu Lab) melting, DSC; Vicat 226–238
2 sources
Annealing responseThe PET matrix crystallises on annealing, which is what separates this grade from PETG-CF
2 sources
Flammability / UL 94Flammable; no UL 94 rating published for standard grades
1 source
Weather & chemical resistance5 fields
Carbon-fibre PET (PET-CF) — Environment & Chemical
Property and unitPublished value and conditionsSources and dates
Chemical resistanceWithstands acids, alkalis, oils and UV exposure
1 source
Food contactNot certified for food contact as filament
1 source
Biodegradability / compostabilityNot biodegradable
1 source
RecyclabilityNot accepted in household plastic collection
1 source
Electrical & ESD propertiesSurface resistivity above 10¹² ohm — insulating (Fiberon PET-CF17, ANSI/ESD S11.11)
1 source
Health & safety3 fields
Carbon-fibre PET (PET-CF) — Health & Safety
Property and unitPublished value and conditionsSources and dates
Fume toxicity (1–5)Moderate — measurable VOCs and UFPs, ventilation advised
1 source
Ventilation / filtration requirement (1–5)Ventilated room or enclosure recommended
2 sources
Dust & fibre handling hazardCarbon fibre is bound in the matrix; sanding dust should not be inhaled
1 source
Finishing & post-processing5 fields
Carbon-fibre PET (PET-CF) — Post-Processing
Property and unitPublished value and conditionsSources and dates
Sanding & machiningSands poorly — the material is tough and gums rather than powders
1 source
Gluing & solvent weldingCyanoacrylate; no common solvent welds PETG cleanly
1 source
Vapour / chemical smoothingNo practical vapour smoothing
1 source
Support material pairingPrints its own supports; Polymaker rates PolyDissolve S1 for PETG
1 source
Dimensional accuracy & detailBambu Lab markets it on low warping and shrinkage relative to other high-temperature composites
1 source
Solvents & solubility3 fields
Carbon-fibre PET (PET-CF) — Solvents & Solubility
Property and unitPublished value and conditionsSources and dates
Soluble inNone common; fluorinated solvents such as hexafluoroisopropanol dissolve linear polyester at 23 °C. Laboratory only.
2 sources
Softened or crazed byEnsinger rates polyester not resistant to chloroform or dichloromethane and only conditionally resistant to acetone and MEK.
1 source
Solvent welding & smoothing agentDichloromethane attacks polyester and can be brushed on, but the carbon fibre blocks any useful surface flow.
2 sources
How to read these values

Values describe representative grades, not every spool. Manufacturer datasheets and independent tests retain their source labels and dates. Printed orientation, test method, conditioning and formulation can change results. Unknown values are —. A listed use is not a certification. Shore A, Shore D and Rockwell hardness are separate scales.

Find a specific filament

Product listings and datasheets

4 listings

Historical USD/kg snapshots. Read each listing’s sale/from qualifiers, spool mass, source date, shipping and tax notes. Product figures are separate from the material summary.

Browse 4 products from 4 brands
ELEGOOPET-CF26.00 USD/kg

$129.99 / 5 kg = $26.00/kg, us.elegoo.com product catalogue, Aug 2026

Handle pet-cf-filament-5-kg; the 1 kg listing is $29.99. ELEGOO publishes printed X-Y and Z strength figures without naming a test standard, so they are recorded here rather than as specs: tensile 84 ± 3 MPa XY / 40 ± 2 MPa Z, bending 136 ± 2 MPa XY, impact 40.2 ± 2.5 kJ/m² XY.

Open product listing ↗
ELEGOO PET-CF — product-specific figures
Density (g/cm³)1.32 (ELEGOO published spec table)
Nozzle temperature (°C)260–290
Bed temperature (°C)90–110
Recommended chamber temperature (°C)45–60
Nozzle hardness required (1–4)Hardened steel required, 0.4 mm or larger
Drying temperature & time80 ± 5 °C for 8 h; drying required
Elongation at break (%)6.3 ± 1.2 (printed XY); 4.1 printed Z
HDT at 0.45 MPa (°C)194 (0.45 MPa) after annealing 8 h at 100 °C
Melting point / Vicat (°C)255 melting; Vicat 112 after annealing
Annealing responseAnnealing 8 h at 100 °C raises HDT at 0.45 MPa to 194 °C and Vicat to 112 °C
Siraya TechFibreheart PET-CF34.99 USD/kg

$34.99 / 1 kg spool, siraya.tech US store, Aug 2026 (list $49.99); 2.5 kg spool $74.99

15 % carbon fibre. TDS gives annealed and unannealed figures; the annealed HDT rises to 118 °C at 1.8 MPa.

Open product listing ↗
Siraya Tech Fibreheart PET-CF — product-specific figures
Tensile strength (XY) (MPa)74 unannealed, 73 annealed (printed XY, ASTM D638)
Young's modulus (MPa)5950 unannealed, 6700 annealed (printed XY, ASTM D638)
Elongation at break (%)2.5 unannealed, 1.5 annealed (printed XY, ASTM D638)
Charpy impact, notched (kJ/m²)9 unannealed, 4.8 annealed (printed, ISO 179)
Layer adhesion / Z tensile (MPa)35 (printed Z, ASTM D638)
HDT at 0.45 MPa (°C)86.7 unannealed, 176 annealed (ISO 75 method B, 0.45 MPa)
HDT at 1.8 MPa (°C)76.6 unannealed, 118 annealed (ISO 75 method A, 1.8 MPa)
Glass transition (Tg) (°C)80 (ASTM D3418)
Bambu LabPET-CF44.99 USD/kg

$44.99 / 1 kg spool, us.store.bambulab.com, Aug 2026

HDT 205 °C at 0.45 MPa and 182 °C at 1.8 MPa. Needs an 80 °C dry and a 45–60 °C chamber.

Open product listing ↗
Bambu Lab PET-CF — product-specific figures
Density (g/cm³)1.29 (ISO 1183)
Tensile strength (XY) (MPa)74 ± 6 (printed XY, ISO 527)
HDT at 0.45 MPa (°C)205 (ISO 75, 0.45 MPa)
HDT at 1.8 MPa (°C)182 (ISO 75, 1.8 MPa)
PolymakerFiberon PET-CF1749.98 USD/kg

$24.99 / 0.5 kg spool = $49.98/kg, Polymaker product catalogue, Aug 2026

Handle fiberon-pet-cf17. 17 wt% carbon fibre; Young's modulus 5481 MPa printed XY.

Open product listing ↗
Polymaker Fiberon PET-CF17 — product-specific figures
Density (g/cm³)1.34 (ISO 1183)
Nozzle temperature (°C)270–300
Bed temperature (°C)70–80
Equilibrium moisture content at ~50 % RH (%)0.53 equilibrium water absorption at 70 % RH, 23 °C
Tensile strength (XY) (MPa)65.9 ± 1.0 (printed XY, ISO 527); Z 27.9
Young's modulus (MPa)5481.0 ± 223.7 (printed XY, ISO 527)
Elongation at break (%)2.4 ± 0.5 (printed XY, ISO 527); Z 0.8
Flexural strength (MPa)109.3 ± 2.0 (printed XY, ISO 178); Z 43.4
Flexural modulus (MPa)4744.4 ± 136.3 (printed XY, ISO 178); Z 2768.2
Charpy impact, notched (kJ/m²)5.1 ± 0.2 (printed XY, ISO 179, notched)
Other impact dataCharpy unnotched 25.1 kJ/m² XY, 3.1 kJ/m² Z (printed, ISO 179)
Layer adhesion / Z tensile (MPa)27.9 ± 1.3 (printed Z, ISO 527)
Z strength as % of XY (%)42 (printed Z 27.9 vs XY 65.9, ISO 527)
HDT at 0.45 MPa (°C)147.5 (ISO 75, 0.45 MPa)
HDT at 1.8 MPa (°C)105 (ISO 75, 1.8 MPa)
Glass transition (Tg) (°C)79.3 (DSC)
Melting point / Vicat (°C)241.3 melting (DSC); Vicat 238.4 (ISO 306)
Flammability / UL 94UL 94 HB at 1.5 mm
Electrical & ESD propertiesSurface resistivity >10^12 Ω (ANSI/ESD S11.11)
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