3D Printing Info

Filament comparison

PETG vs TPU 98A

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

PETG guideTPU 98A / hard TPU guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PETG comparisonsMore TPU 98A comparisons
PETG vs TPU 98A — documented properties and sources
PropertyPETGPETGTPU 98A / hard TPUFLEX
Market snapshot
Listing priceUSD/kg; dated snapshots$19.99/kg median; $8.99–$69.99/kg across 21 dated product listings$94.99/kg median; $34.99–$149.99/kg across 3 dated product listings
Identity & Market
Base polymer / chemistryPolyethylene terephthalate glycol copolymer — PET with a glycol comonomer that suppresses crystallisation[1][2]Hard thermoplastic polyurethane at 98 Shore A to about 60 Shore D — the rigid end of the TPU range[3][4]
Densityg/cm³1.24–1.30 (ISO 1183)[1][2][5][6]1.23 (Fillamentum Flexfill 98A); 1.2 (Extrudr FLEX HARD, ISO 2781)[3][4]
Typical priceUSD/kg1 kg spools cluster near 20[7][8][9]1 kg spools cluster near 150[10]
Price range across brandsUSD/kg12–70 across brands; IEMAI 12, ELEGOO 14, CHCKX 14, Bambu Lab 18–20, Hatchbox 26, Prusament 38, Prusament PETG V0 70[7][8][11][9][12][13]95–150 across brands; Proto-pasta Clear Rigid TPU 95, Push Plastic TPU 100A 150[14][10]
Market availability1–5Ubiquitous, every brand and retailer[7][8][15][9]Available from several mainstream brands[10][14][4]
Spool sizes & diameters1.75 and 2.85 mm; 0.75, 0.8 and 1 kg spools plus spool-less refills[8][9]1.75 and 2.85 mm; 0.5, 0.75 and 1 kg spools[14][10]
Typical applicationsFunctional parts, enclosures and outdoor fittings that need more toughness and heat tolerance than PLA[1][2]Drive belts, wheels, snap-fits and bumpers that need to flex but hold shape under load[3]
Diameter tolerance± mm±0.02 (Prusament)[1]Not documented
Printing Parameters
Nozzle temperature°C230–260 across brands; Prusament 250 ± 10, Polymaker 240–260[1][2][6]230–260 (Extrudr FLEX HARD)[4]
Bed temperature°C60–90; Prusament 80 ± 10, Polymaker 60–70[1][6]50–90 (Extrudr FLEX HARD)[4]
Enclosure / chamber requirement1–5Open frame is fine[6]Open frame is fine[4]
Part cooling fanAround 50 %; Polymaker specifies 20–60 %, less than PLA to protect layer bonding[1][6]0–30 % (Extrudr FLEX HARD)[4]
Bed surface & adhesion aidTextured 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[1][6]PEI sheet or painter's tape; Polymaker warns TPU can over-stick and advises a glue stick as a release agent[16][17]
Maximum volumetric flow (mm³/s; see test conditions)mm³/s8–15 (PrusaSlicer guidance); My Tech Fun ran Bambu Lab PETG Basic at 13 mm³/s[18][19]4.6 (Extrudr FLEX HARD, stated max volumetric speed on a 0.4 mm nozzle)[4]
Warping tendency1–5Slight — corner lift on large flat parts[1][6]None[4]
Bed-adhesion difficulty1–5Needs the right surface or a thin adhesive — the problem is releasing the part, not sticking it[1]Not documented
Stringing / oozing tendency1–5Moderate — retraction tuning needed[1][6]Not documented
Overall printing difficulty1–5Easy — minor profile tuning[6]Easy — minor profile tuning; at this hardness the filament pushes like a rigid material[4]
Extruder requirementNot documentedBowden viable at this hardness — Extrudr rates FLEX HARD to 100 mm/s where its soft grades cap lower[4]
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely[18]Brass fine indefinitely[4]
Abrasiveness1–5Non-abrasive[6]Non-abrasive[4]
Nozzle clog risk1–5Low — no special hot-end required and clogging is not among the listed drawbacks; Prusa lists no drybox and no hardened nozzle[20][21]Low[22]
Heat-creep / jam sensitivity1–5Slightly sensitive[20]Moderate — good heatbreak cooling needed[17]
Hotend requirementNo special hot-end required[20]No special hot-end required, but a direct-drive extruder is (Simplify3D)[16]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Moderate (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[1][23]Moderate — the TPU family absorbs readily; Extrudr specifies a 12 h dry at 60 °C for FLEX HARD[4][22]
Equilibrium moisture content at ~50 % RH%0.10 after 7 days at 24 °C / 22 % RH (Prusa Polymers); 0.40 saturated at 25 °C / 55 % RH (Bambu Lab)[1][23]Not documented
Drying temperature & time60–65 °C for 6–8 h[6][23]60 °C for 12 h (Extrudr FLEX HARD)[4]
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface[1]Bubbling and popping at the nozzle, stringing and a rough surface[22]
Effect of moisture on strengthPolymaker 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[22]Polymaker groups TPU with the highly hygroscopic materials; no dry-versus-conditioned figures are published[22]
Storage requirementSealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[22][24]Sealed with desiccant; often kept in a dryer during the print[22]
Mechanical Properties
Tensile strength (XY)MPa38–51 (printed XY, ISO 527); Prusament 47 ± 2 at yield; 62 on My Tech Fun 4×4 mm bars[1][2][5][25]53.7 at break (Fillamentum Flexfill 98A, DIN 53504)[3]
Young's modulusMPa1500–2311 (printed XY, ISO 527)[1][2][5][6]Not documented
Elongation at break%5.2–9.3 at break (printed XY, ISO 527); Prusament 5.1 at yield[2][5][6][1]318 at break (Fillamentum Flexfill 98A, DIN 53504); Extrudr FLEX HARD 490 (ISO 527-2)[3][4]
Flexural strengthMPa58–80 (printed XY, ISO 178); Prusament 66 ± 2[1][2][5][6]Not documented
Flexural modulusMPa1068–2277 (printed XY, ISO 178)[1][2][5][6]Not documented
Charpy impact, notchedkJ/m²2.6 (PolyLite) to 11.6 (PolyMax) printed XY, ISO 179, notched; Prusament 6 ± 1[2][5][1]Not documented
Other impact dataCharpy unnotched does not break on Prusa's 4 J pendulum (ISO 179-1); Izod 3.37 kJ/m² on My Tech Fun printed bars[1][25]Not documented
Layer adhesion / Z tensileMPa18 ± 4 (Prusa interlayer adhesion test); 42.8 printed Z for PolyLite PETG; 33 on My Tech Fun bars[1][2][25]Not documented
Brittleness1–5Moderate[1][2]Very ductile — bends far before failing[3]
Hardness (scale-specific)Shore A / Shore D / Rockwell74 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[1][25][26][27]98 Shore A and 60 Shore D (Fillamentum, ISO 7619-1); Extrudr FLEX HARD 58 Shore D (ISO 868)[3][4]
Creep resistance / sustained load1–5Below 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[25][19]Poor — no 98A creep test; a printed 95A TPU bar crept from 74.5 to 82.7 mm over 5 days at 1.25 kg[28]
Fatigue / repeated-flex resistance1–5Moderate — 79 000–193 000 cycles at 30 % of tensile strength, about three times printed PLA (R = 0.2, 7 Hz)[29]Excellent — living hinges viable[17]
Elasticity / flexibility1–5Slightly flexible in thin sections[1]Semi-flexible[3][4]
Z strength as % of XY%84 (PolyLite, printed Z against XY tensile)[2]Not documented
Wear resistance & frictionNot documentedAbrasion 23 mm³ (Fillamentum, ISO 4649 method A) and 26 mm³ (Extrudr FLEX HARD, ISO 4649-A) — the best abrasion figures in the group[3][4]
Thermal Properties
HDT at 0.45 MPa°C68 (Prusament) to 78 (PolyLite), ISO 75 at 0.45 MPa[1][2][6]Not documented
HDT at 1.8 MPa°C65 (Polymaker) to 75 (PolyLite), ISO 75 at 1.8 MPa; Prusament 68[1][2][6]Not documented
Glass transition (Tg)°C71–81 (DSC)[2][5][6]Not documented
Melting point / Vicat°CAmorphous — no melting point; Vicat 75–84 (ISO 306)[2][5][6]190–210 melting (Extrudr FLEX HARD, ISO 3146-C); Vicat A 140 (ISO 306)[4]
Continuous service temperature°C61–66 — loaded bars begin to move at this temperature across six grades from four brands; Prusa publishes 68 for Prusament PETG[25][26][27][19][30]Not documented
Thermal expansion (CTE)µm/m·K65 at 30 °C (neat PETG, large-format printed bead, TMA)[31]Not documented
Flammability / UL 94Flammable; no UL 94 rating published for standard PETG, though flame-retardant V0 grades exist[32][24]Not documented
Environment & Chemical
UV resistance1–5Moderate — a season or two[1]Good — years with some colour shift; Polymaker lists UV exposure among the conditions TPU withstands[17]
Chemical resistanceWithstands acids, alkalis, oils and UV exposure — Polymaker names outdoor use as a result[24]Withstands industrial solvents and UV exposure (Polymaker)[17]
Water / humidity resistance in service1–5Good — minor absorption[1]Not documented
Food contactPET is the polymer of drinks bottles, but printed layer grooves harbour bacteria and no filament here carries a food-contact certification[24]Not food safe without specific certification (Polymaker)[17]
Biodegradability / compostabilityNot biodegradable[24]Not biodegradable[17]
RecyclabilityPET is widely recycled as bottle stock, but printed PETG waste is not accepted in household collection[24]Not accepted in household plastic collection[17]
Health & Safety
Fume toxicity1–5Moderate — measurable VOCs and UFPs, ventilation advised[33]Low hazard — minimal VOC and particle emission; TPU was not among the nine filaments in the chamber study[33]
Ultrafine-particle emission rateparticles/min≈5 × 10⁹ median for the PET-based T-Glase filament in the same chamber study, against ≈1 × 10⁸ for PLA[33]Not documented
Ventilation / filtration requirement1–5Open a window / occasional ventilation[33]Open a window / occasional ventilation[33]
Post-Processing
Sanding & machiningSands poorly — the material is tough and gums rather than powders[20]Difficult to sand or smooth; Polymaker limits post-processing to trimming or tumbling[17]
Painting & finishingPaint adheres poorly without abrasion and a primer[1]Not documented
Gluing & solvent weldingCyanoacrylate; no common solvent welds PETG cleanly[20]Cyanoacrylate bonds TPU; no common solvent welds it[17]
Vapour / chemical smoothingNo practical vapour smoothing[1]No practical vapour smoothing[17]
Support material pairingPrints its own supports; Polymaker rates PolyDissolve S1 for PETG[20]Polymaker warns TPU supports are often very difficult to remove[17]
Dimensional accuracy & detailStringing and blobbing are the usual accuracy limits, not shrinkage[1][6]Tear strength 170 kN/m (Fillamentum, ISO 34-1) and 175 kN/m (Extrudr FLEX HARD, ISO 34-1B)[3][4]
Solvents & Solubility
Soluble inNo common workshop solvent; 1,2-dichloroethane destroys it inside a week and dichloromethane — a carcinogen — dissolves the surface.[34][35]DMF, DMSO, NMP and THF dissolve TPU; acetone, MEK and cyclohexanone are partial solvents. All laboratory reagents.[36]
Softened or crazed byAcetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[34]Toluene and benzene swell it up to +50 % by weight at 23 °C; esters swell it severely; ethanol and IPA soften it.[36]
Solvent welding & smoothing agentDichloromethane brushed on is the only agent that smooths PETG — a controlled carcinogen, not workshop stock.[35]None practical — the true solvents (DMF, THF, NMP) are laboratory reagents and leave the joint swollen and weak.[36]

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. Prusament PETG Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  2. PolyLite PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  3. Flexfill TPU 98A Technical Data Sheet Fillamentum · 2019-08 · tds
  4. Extrudr Product Catalogue (DURAPRO PA12 data block) Extrudr · 2025-03 · tds
  5. PolyMax PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  6. Polymaker PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  7. PETG Basic — product page Bambu Lab US Store · 2026-08 · vendor
  8. Polymaker product catalogue Polymaker · 2026-08 · vendor
  9. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  10. Push Plastic product catalogue Push Plastic · 2026-08 · vendor
  11. Black PETG Filament 1.75 mm 1 kg — product data Hatchbox · 2026-08 · vendor
  12. IEMAI PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  13. CHCKX PETG 3D Printer Filament 1.75 mm 1 kg, Black CHCKX (Amazon US) · 2026-08 · vendor
  14. Proto-pasta product catalogue Proto-pasta · 2026-08 · vendor
  15. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  16. Flexible (TPE/TPU) — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  17. TPU — material basics Polymaker Wiki · 2026-08 · doc
  18. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  19. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  20. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  21. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  22. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  23. Bambu Filament Technical Data Sheet — PETG HF Bambu Lab · 2026-08 · tds
  24. PETG — material basics Polymaker Wiki · 2026-08 · doc
  25. PCTG vs PETG comparison — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  26. Extrudr PETG vs PCTG vs XPETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  27. Prusament PETG-CF vs PETG V0 vs PETG — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  28. BambuLab TPU 95A HF vs Qidi TPU 95A HF — results spreadsheet My Tech Fun (Igor Gaspar) · 2024-02 · test
  29. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  30. Prusament PETG — material page Prusa Polymers · 2026-08 · doc
  31. 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
  32. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  33. 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
  34. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  35. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  36. Elastollan — Chemical properties: swelling and chemical resistance BASF · 2026-08 · tds