3D Printing Info

Filament comparison

PEKK vs PETG

Compare printing settings, strength, heat resistance, dated prices and sources.

PEKK guidePETG guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PEKK comparisonsMore PETG comparisons
PEKK vs PETG — documented properties and sources
PropertyPEKKHIGHTEMPPETGPETG
Market snapshot
Listing priceUSD/kg; dated snapshots$525.00/kg median; $332.50–$771.12/kg across 6 dated product listings$19.99/kg median; $8.99–$69.99/kg across 21 dated product listings
Identity & Market
Base polymer / chemistryPolyether ketone ketone, amorphous grade — a polyaryletherketone that stays amorphous, so it does not need PEEK's crystallisation control. Stratasys sells it as Antero 800NA and Antero 840CN03; category numbers below are unfilled unless a carbon grade is named[1][2]Polyethylene terephthalate glycol copolymer — PET with a glycol comonomer that suppresses crystallisation[3][4]
Densityg/cm³1.28 unfilled (ASTM D792, Antero 800NA; 1.31 annealed) and 1.33 for CarbonX PEKK-A CF15 (ISO 1183)[2][1]1.24–1.30 (ISO 1183)[3][4][5][6]
Typical priceUSD/kg1 kg-equivalent spools cluster near 550[7][8][9]1 kg spools cluster near 20[10][11][12]
Price range across brandsUSD/kg333-771 across grades and formats; 3DXTech CarbonX PEKK-A+CF15 333 at 2 kg, 3D4Makers unfilled PEKK-A 485 at 2 kg, IEMAI 3D 500 at 1 kg, Kimya PEKK Carbon 771 at 500 g[7][8][9][13][14]12–70 across brands; IEMAI 12, ELEGOO 14, CHCKX 14, Bambu Lab 18–20, Hatchbox 26, Prusament 38, Prusament PETG V0 70[10][11][15][12][16][17]
Market availability1–5Niche, a handful of specialist brands[7][8][9]Ubiquitous, every brand and retailer[10][11][18][12]
Spool sizes & diameters1.75 and 2.85 mm; 200 g to 2 kg spools, plus Stratasys canisters[7][8][2]1.75 and 2.85 mm; 0.75, 0.8 and 1 kg spools plus spool-less refills[11][12]
Typical applicationsAerospace interior and structural parts; 3DXTech labels its carbon-filled PEKK-A grade AERO and Stratasys certifies Antero 800NA for outgassing and FST[1][2]Functional parts, enclosures and outdoor fittings that need more toughness and heat tolerance than PLA[3][4]
Diameter tolerance± mmNot documented±0.02 (Prusament)[3]
Printing Parameters
Nozzle temperature°CNot documented230–260 across brands; Prusament 250 ± 10, Polymaker 240–260[3][4][6]
Bed temperature°C140 (3DXTech CarbonX PEKK-A CF15)[1]60–90; Prusament 80 ± 10, Polymaker 60–70[3][6]
Enclosure / chamber requirement1–5Actively heated chamber required[19][20]Open frame is fine[6]
Part cooling fanNot documentedAround 50 %; Polymaker specifies 20–60 %, less than PLA to protect layer bonding[3][6]
Bed surface & adhesion aidNot documentedTextured PEI, satin or powder-coated sheets. On smooth PEI a glue stick is used as a release agent, not an adhesive — PETG bonds to bare PEI hard enough to tear the sheet[3][6]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented8–15 (PrusaSlicer guidance); My Tech Fun ran Bambu Lab PETG Basic at 13 mm³/s[21][22]
Warping tendency1–5Not documentedSlight — corner lift on large flat parts[3][6]
Bed-adhesion difficulty1–5Not documentedNeeds the right surface or a thin adhesive — the problem is releasing the part, not sticking it[3]
Stringing / oozing tendency1–5Not documentedModerate — retraction tuning needed[3][6]
Overall printing difficulty1–5Expert / industrial hardware only[19][20]Easy — minor profile tuning[6]
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required — the category spans unfilled PEKK, where brass is acceptable, and the carbon-filled aerospace grades that make up most of the market[1][2]Brass fine indefinitely[21]
Abrasiveness1–5Highly abrasive — most PEKK filament sold is carbon-filled; unfilled Antero 800NA and ThermaX PEKK-A are non-abrasive[1][2]Non-abrasive[6]
Nozzle clog risk1–5Moderate — needs dry filament and a clean nozzle; 3DXTech lists no special nozzle concerns but a mandatory 120 °C pre-dry before every print[23]Low — no special hot-end required and clogging is not among the listed drawbacks; Prusa lists no drybox and no hardened nozzle[24][25]
Heat-creep / jam sensitivity1–5Not documentedSlightly sensitive[24]
Hotend requirementNot documentedNo special hot-end required[24]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Not documentedModerate (0.3–0.8 %) — Bambu Lab reports 0.40 % saturated at 25 °C / 55 % RH; Prusa measures only 0.07 % in 24 h and 0.10 % in 7 days at the drier 22 % RH[3][26]
Equilibrium moisture content at ~50 % RH%Not documented0.10 after 7 days at 24 °C / 22 % RH (Prusa Polymers); 0.40 saturated at 25 °C / 55 % RH (Bambu Lab)[3][26]
Drying temperature & timeNot documented60–65 °C for 6–8 h[6][26]
Symptoms when wetNot documentedBubbling and popping at the nozzle, stringing and a rough surface[3]
Effect of moisture on strengthNo dry-versus-conditioned figures are published; 3DXTech mandates a 120 °C, 4 h pre-dry before every print because trapped water flashes to steam at these nozzle temperatures[23]Polymaker groups PETG with nylon, PVA and TPU as highly hygroscopic and shows a before-and-after-drying comparison; the loss appears as poor layer adhesion and weak, brittle layers rather than a published dry-versus-conditioned figure[27]
Storage requirementNot documentedSealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[27][28]
Mechanical Properties
Tensile strength (XY)MPa86.7-90.0 at yield and 73.0 at break (printed XZ, ASTM D638, Antero 800NA on the F900 and Fortus 450mc); 88.8 at break annealed; 126 at break for CarbonX PEKK-A CF15 (printed XY, ISO 527)[2][1]38–51 (printed XY, ISO 527); Prusament 47 ± 2 at yield; 62 on My Tech Fun 4×4 mm bars[3][4][5][29]
Young's modulusMPa2640-3870 (printed XZ, ASTM D638, Antero 800NA; upper figure annealed); 9125 for CarbonX PEKK-A CF15 (printed XY, ISO 527)[2][1]1500–2311 (printed XY, ISO 527)[3][4][5][6]
Elongation at break%6.1 at break (printed XZ, ASTM D638, Antero 800NA); 2.3 in ZX; 3.15 for CarbonX PEKK-A CF15 (ISO 527)[2][1]5.2–9.3 at break (printed XY, ISO 527); Prusament 5.1 at yield[4][5][6][3]
Flexural strengthMPa136 at 5 % strain (printed XZ, ASTM D790, Antero 800NA); 178 for CarbonX PEKK-A CF15 (printed XY, ISO 178)[2][1]58–80 (printed XY, ISO 178); Prusament 66 ± 2[3][4][5][6]
Flexural modulusMPa3200 (printed XZ, ASTM D790, Antero 800NA); 8817 for CarbonX PEKK-A CF15 (printed XY, ISO 178)[2][1]1068–2277 (printed XY, ISO 178)[3][4][5][6]
Charpy impact, notchedkJ/m²Not documented2.6 (PolyLite) to 11.6 (PolyMax) printed XY, ISO 179, notched; Prusament 6 ± 1[4][5][3]
Other impact dataIzod notched 41.1 J/m XZ and 33.3 J/m ZX; unnotched 1730 J/m XZ against 203 J/m ZX (printed, ASTM D256/D4812, Antero 800NA)[2]Charpy unnotched does not break on Prusa's 4 J pendulum (ISO 179-1); Izod 3.37 kJ/m² on My Tech Fun printed bars[3][29]
Layer adhesion / Z tensileMPa50.1-59.4 at yield (printed ZX, ASTM D638, Antero 800NA); 56.0 for the ESD grade Antero 840CN03[2][30]18 ± 4 (Prusa interlayer adhesion test); 42.8 printed Z for PolyLite PETG; 33 on My Tech Fun bars[3][4][29]
Brittleness1–5Moderate unfilled — 6.1 % elongation at break in plane; brittle in the carbon-filled grades at 3.15 %[2][1]Moderate[3][4]
Hardness (scale-specific)Shore A / Shore D / RockwellNot documented74 Shore D (Prusa Polymers method); measured on printed bars at 68.2 for Extrudr PETG, 72 for Fiberlogy PETG and 72.8 for Prusament PETG[3][29][31][32]
Creep resistance / sustained load1–5Excellent — holds load for years. Antero 800NA still holds 82 % of its room-temperature ZX tensile strength at 104 °C and 63 % at 132 °C (printed, ASTM D638)[2]Below average — a 12 mm bar sagged to 18.2 mm (Fiberlogy) and 19.4 mm (Bambu Lab Basic) over 5 days at 1.25 kg[29][22]
Fatigue / repeated-flex resistance1–5Not documentedModerate — 79 000–193 000 cycles at 30 % of tensile strength, about three times printed PLA (R = 0.2, 7 Hz)[33]
Elasticity / flexibility1–5Rigid[1]Slightly flexible in thin sections[3]
Z strength as % of XY%56-82 (Antero 800NA and 840CN03 printed on the F900 and Fortus 450mc, ZX against XZ tensile yield and break, ASTM D638)[2][30]84 (PolyLite, printed Z against XY tensile)[4]
Thermal Properties
HDT at 0.45 MPa°C158 (printed XY and ZX, ASTM D648 Method B at 66 psi, Antero 800NA); 285 for CarbonX PEKK-A CF15 (ISO 75 at 0.45 MPa)[2][1]68 (Prusament) to 78 (PolyLite), ISO 75 at 0.45 MPa[3][4][6]
HDT at 1.8 MPa°C156-157 (printed, ASTM D648 Method B at 264 psi, Antero 800NA); moulded 147[2]65 (Polymaker) to 75 (PolyLite), ISO 75 at 1.8 MPa; Prusament 68[3][4][6]
Glass transition (Tg)°C156 (ASTM D7426, Antero 800NA); 165 for CarbonX PEKK-A CF15 (DSC)[2][1]71–81 (DSC)[4][5][6]
Melting point / Vicat°C300 melt point (ASTM D7426 peak heat, Antero 800NA); 305 for CarbonX PEKK-A CF15 (DSC)[2][1]Amorphous — no melting point; Vicat 75–84 (ISO 306)[4][5][6]
Continuous service temperature°CNot documented61–66 — loaded bars begin to move at this temperature across six grades from four brands; Prusa publishes 68 for Prusament PETG[29][31][32][22][34]
Thermal expansion (CTE)µm/m·K36.1 in XY and 50.2 in ZX (printed, 40-140 °C, ASTM E831, Antero 800NA); 47.4 and 51.2 for the ESD grade Antero 840CN03[2][30]65 at 30 °C (neat PETG, large-format printed bead, TMA)[35]
Flammability / UL 94Not documentedFlammable; no UL 94 rating published for standard PETG, though flame-retardant V0 grades exist[36][28]
Environment & Chemical
UV resistance1–5Good — years with some colour shift. 1000 h of QUV cycling to ASTM G154 left Antero 800NA's yield strength unchanged at 57 MPa and raised stress at break 3.6 %[2]Moderate — a season or two[3]
Chemical resistanceNot documentedWithstands acids, alkalis, oils and UV exposure — Polymaker names outdoor use as a result[28]
Water / humidity resistance in service1–5Not documentedGood — minor absorption[3]
Food contactNot documentedPET is the polymer of drinks bottles, but printed layer grooves harbour bacteria and no filament here carries a food-contact certification[28]
Biodegradability / compostabilityNot documentedNot biodegradable[28]
RecyclabilityNot documentedPET is widely recycled as bottle stock, but printed PETG waste is not accepted in household collection[28]
Electrical & ESD propertiesUnfilled PEKK is an insulator at above 1.4e14 ohm-cm (ASTM D257); CarbonX PEKK-A CF15 sits above 10^7 ohm/sq, and the Antero 840CN03 ESD grade is specified at 10^4-10^9 ohm-cm[2][1][30]Not documented
Health & Safety
Fume toxicity1–5Moderate — measurable VOCs and UFPs, ventilation advised. None of these polymers was in the chamber study, and all are processed far above the temperatures it covered[37]Moderate — measurable VOCs and UFPs, ventilation advised[37]
Ultrafine-particle emission rateparticles/minNot documented≈5 × 10⁹ median for the PET-based T-Glase filament in the same chamber study, against ≈1 × 10⁸ for PLA[37]
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[37]Open a window / occasional ventilation[37]
Dust & fibre handling hazardCarbon fibre is bound in the matrix; sanding dust should not be inhaled[1]Not documented
Post-Processing
Sanding & machiningNot documentedSands poorly — the material is tough and gums rather than powders[24]
Painting & finishingNot documentedPaint adheres poorly without abrasion and a primer[3]
Gluing & solvent weldingNot documentedCyanoacrylate; no common solvent welds PETG cleanly[24]
Vapour / chemical smoothingNot documentedNo practical vapour smoothing[3]
Support material pairingNot documentedPrints its own supports; Polymaker rates PolyDissolve S1 for PETG[24]
Dimensional accuracy & detailNot documentedStringing and blobbing are the usual accuracy limits, not shrinkage[3][6]
Solvents & Solubility
Soluble inConcentrated sulphuric acid, as for PEEK; no common organic solvent touches a polyaryletherketone.[38][39]No common workshop solvent; 1,2-dichloroethane destroys it inside a week and dichloromethane — a carcinogen — dissolves the surface.[40][41]
Softened or crazed byConcentrated sulphuric acid and liquid Freon are the entries Ensinger marks not resistant; acetone, MEK and toluene do nothing.[38]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[40]
Solvent welding & smoothing agentNone — no solvent softens a polyaryletherketone.[38]Dichloromethane brushed on is the only agent that smooths PETG — a controlled carcinogen, not workshop stock.[41]

Material entries describe families or representative grades, not an interchangeable specification for every spool. Test methods, orientations and conditions may differ. Unknown values are marked “Not documented”. Prices and source dates remain historical snapshots; check the linked guide for product details. Differences highlight text, not a universal winner.

Sources for this comparison

  1. CarbonX Carbon Fiber PEKK-A CF15 Technical Data Sheet v1 3DXTech · 2026-08 · tds
  2. Antero 800NA — FDM Material Data Sheet (PEKK-based) Stratasys · 2025-08 · tds
  3. Prusament PETG Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  4. PolyLite PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  5. PolyMax PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  6. Polymaker PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  7. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  8. 3D4Makers product catalogue 3D4Makers · 2026-08 · vendor
  9. Kimya PEKK-A Natural 1.75 mm 500 g igo3d · 2026-08 · vendor
  10. PETG Basic — product page Bambu Lab US Store · 2026-08 · vendor
  11. Polymaker product catalogue Polymaker · 2026-08 · vendor
  12. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  13. Kimya PEKK Carbon Grey 1.75 mm 500 g igo3d · 2026-08 · vendor
  14. IEMAI 3D PEKK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  15. Black PETG Filament 1.75 mm 1 kg — product data Hatchbox · 2026-08 · vendor
  16. IEMAI PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  17. CHCKX PETG 3D Printer Filament 1.75 mm 1 kg, Black CHCKX (Amazon US) · 2026-08 · vendor
  18. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  19. Prusament PEI 1010 Technical Datasheet v1.0 Prusa Polymers · 2024-09 · tds
  20. Prusament PEI 1010 — material page Prusa Polymers · 2026-08 · doc
  21. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  22. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  23. THERMAX PEKK-A — product page (print recommendations) 3DXTech · 2026-08 · doc
  24. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  25. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  26. Bambu Filament Technical Data Sheet — PETG HF Bambu Lab · 2026-08 · tds
  27. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  28. PETG — material basics Polymaker Wiki · 2026-08 · doc
  29. PCTG vs PETG comparison — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  30. Antero 840CN03 — FDM Material Data Sheet (PEKK, ESD) Stratasys · 2024-08 · tds
  31. Extrudr PETG vs PCTG vs XPETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  32. Prusament PETG-CF vs PETG V0 vs PETG — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  33. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  34. Prusament PETG — material page Prusa Polymers · 2026-08 · doc
  35. Effects of Fiber Orientation on the Coefficient of Thermal Expansion of Fiber-Filled Polymer Systems in Large Format Polymer Extrusion-Based Additive Manufacturing Materials 15(8):2764 · 2022-04 · paper
  36. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  37. Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments (Azimi et al.) Environmental Science & Technology 50(3) 1260-1268 · 2016-01 · paper
  38. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  39. The Effects of Sulfonated Poly(ether ether ketone) Ion Exchange Preparation Conditions on Membrane Properties Yee, Zhang & Ladewig, Membranes 3(3) 182–195 · 2013-07 · paper
  40. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  41. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc