3D Printing Info

Filament comparison

ASA-GF vs PETG

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

Glass-fibre ASA (ASA-GF) guidePETG guide

2 selected · all documented properties

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ASA-GF vs PETG — documented properties and sources
PropertyGlass-fibre ASA (ASA-GF)ASAPETGPETG
Market snapshot
Listing priceUSD/kg; dated snapshots$29.95/kg median; $26.99–$33.99/kg across 3 dated product listings$19.99/kg median; $8.99–$69.99/kg across 21 dated product listings
Identity & Market
Base polymer / chemistryASA reinforced with chopped glass fibre — 10 wt% (Spectrum ASA-X GF10), 15 wt% (ZYLtech ASA-GF)[1][2]Polyethylene terephthalate glycol copolymer — PET with a glycol comonomer that suppresses crystallisation[3][4]
Densityg/cm³1.07 (ZYLtech) and 1.11 (Spectrum), ISO 1183[1][2]1.24–1.30 (ISO 1183)[3][4][5][6]
Typical priceUSD/kg1 kg spools cluster near 28[7][8]1 kg spools cluster near 20[9][10][11]
Price range across brandsUSD/kg27–34 across brands; Ambrosia 27, ZYLtech 30, Siraya Tech 34[7][8][12]12–70 across brands; IEMAI 12, ELEGOO 14, CHCKX 14, Bambu Lab 18–20, Hatchbox 26, Prusament 38, Prusament PETG V0 70[9][10][13][11][14][15]
Market availability1–5Niche, a handful of specialist brands[7][1][2]Ubiquitous, every brand and retailer[9][10][16][11]
Spool sizes & diameters1.75 and 2.85 mm; 1 kg spools[2][7]1.75 and 2.85 mm; 0.75, 0.8 and 1 kg spools plus spool-less refills[10][11]
Typical applicationsOutdoor brackets and mounts that need stiffness and dimensional stability under sun and moisture[1][2]Functional parts, enclosures and outdoor fittings that need more toughness and heat tolerance than PLA[3][4]
Diameter tolerance± mm±0.01 at 95 % probability and ±0.02 at 100 % (ZYLtech)[2]±0.02 (Prusament)[3]
Printing Parameters
Nozzle temperature°C240–270 (Spectrum); 240–280 (ZYLtech)[1][2]230–260 across brands; Prusament 250 ± 10, Polymaker 240–260[3][4][6]
Bed temperature°C80–100 (Spectrum); 90–110 on PEI (ZYLtech)[1][2]60–90; Prusament 80 ± 10, Polymaker 60–70[3][6]
Enclosure / chamber requirement1–5Enclosure recommended[17]Open frame is fine[6]
Part cooling fan0–20 % (Spectrum)[1]Around 50 %; Polymaker specifies 20–60 %, less than PLA to protect layer bonding[3][6]
Bed surface & adhesion aidPEI sheet, BuildTak or an adhesion aid such as Magigoo (Polymaker); Simplify3D also lists Kapton tape and ASA slurry[18][19]Textured 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/s2.4–5.6 at Spectrum's 30–70 mm/s on a 0.4 mm nozzle at 0.2 mm layer; ZYLtech allows up to 200 mm/s[1][2][20]8–15 (PrusaSlicer guidance); My Tech Fun ran Bambu Lab PETG Basic at 13 mm³/s[20][21]
Warping tendency1–5Moderate — needs adhesion aid or draught shield[17]Slight — corner lift on large flat parts[3][6]
Bed-adhesion difficulty1–5Needs a specific surface plus adhesive[18]Needs the right surface or a thin adhesive — the problem is releasing the part, not sticking it[3]
Stringing / oozing tendency1–5Slight — Polymaker advises 1–2 mm retraction at 20–30 mm/s[18]Moderate — retraction tuning needed[3][6]
Overall printing difficulty1–5Intermediate — dry filament and a tuned profile; ZYLtech requires a hardened nozzle of 0.6 mm or larger[2][1]Easy — minor profile tuning[6]
Extruder requirementZYLtech specifies a hardened nozzle 0.6 mm or larger; Spectrum bases its settings on a 0.5 mm nozzle[2][1]Not documented
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required — Spectrum recommends ruby or hardened, ZYLtech requires hardened[1][2]Brass fine indefinitely[20]
Abrasiveness1–5Highly abrasive — standard GF composite[1][2]Non-abrasive[6]
Nozzle clog risk1–5Moderate — needs dry filament and a clean nozzle; Prusa lists higher risk of nozzle clogging for glass-filled composites[22]Low — no special hot-end required and clogging is not among the listed drawbacks; Prusa lists no drybox and no hardened nozzle[23][24]
Heat-creep / jam sensitivity1–5Slightly sensitive[19]Slightly sensitive[23]
Hotend requirementNo special hotend required[19]No special hot-end required[23]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Moderate — the ASA matrix takes up 0.40–0.45 % saturated at 25 °C / 55 % RH; no glass-filled grade publishes its own figure[25][26][27]Moderate (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][28]
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][28]
Drying temperature & timeNot documented60–65 °C for 6–8 h[6][28]
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface[29]Bubbling and popping at the nozzle, stringing and a rough surface[3]
Effect of moisture on strengthNo dry-versus-conditioned figures are published; Polymaker groups the styrenics as moderate-sensitivity and absorbed water shows as bubbling and poor layer adhesion[29]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[29]
Storage requirementSealed with desiccant; Polymaker rates the styrenics moderate-sensitivity[29]Sealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[29][30]
Mechanical Properties
Tensile strength (XY)MPa33–36 at break, ISO 527 (ZYLtech; specimen type not stated); Spectrum quotes 55 at break on injection-moulded specimens[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][31]
Young's modulusMPa2540–2890 (ZYLtech; specimen type not stated) and 2550 (Spectrum, injection-moulded), ISO 527[2][1]1500–2311 (printed XY, ISO 527)[3][4][5][6]
Elongation at break%3.4 at break (ZYLtech; specimen type not stated); Spectrum quotes 2.80 at yield on injection-moulded specimens[2][1]5.2–9.3 at break (printed XY, ISO 527); Prusament 5.1 at yield[4][5][6][3]
Flexural strengthMPaNot documented58–80 (printed XY, ISO 178); Prusament 66 ± 2[3][4][5][6]
Flexural modulusMPa2130–2480 flexural modulus, ISO 178 (ZYLtech; specimen type not stated)[2]1068–2277 (printed XY, ISO 178)[3][4][5][6]
Charpy impact, notchedkJ/m²8.3 notched Charpy at 23 °C on injection-moulded specimens (Spectrum, ISO 179-1eA); ZYLtech publishes notched Izod 6.9 by ISO 180 instead[1][2]2.6 (PolyLite) to 11.6 (PolyMax) printed XY, ISO 179, notched; Prusament 6 ± 1[4][5][3]
Other impact dataCharpy unnotched 25 kJ/m² at 23 °C on injection-moulded specimens (Spectrum, ISO 179-1eU); ZYLtech notched Izod 6.9 kJ/m² (ISO 180)[1][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][31]
Layer adhesion / Z tensileMPaNot documented18 ± 4 (Prusa interlayer adhesion test); 42.8 printed Z for PolyLite PETG; 33 on My Tech Fun bars[3][4][31]
Brittleness1–5Brittle — snaps with little warning; elongation at break 3.4 %[2]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][31][32][33]
Creep resistance / sustained load1–5Good — no creep test found; chopped glass fibre lifts modulus to 2540–2890 against 2379–2450 for unfilled ASA[2][26][25]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[31][21]
Fatigue / repeated-flex resistance1–5Below average — no GF-grade S-N curve; elongation at break falls to 3.4 % against 6.7–9.2 % for unfilled ASA[2][26][25]Moderate — 79 000–193 000 cycles at 30 % of tensile strength, about three times printed PLA (R = 0.2, 7 Hz)[34]
Elasticity / flexibility1–5Rigid[2]Slightly flexible in thin sections[3]
Z strength as % of XY%Not documented84 (PolyLite, printed Z against XY tensile)[4]
Thermal Properties
HDT at 0.45 MPa°C100 (Spectrum, injection-moulded, ISO 75 at 0.45 MPa)[1]68 (Prusament) to 78 (PolyLite), ISO 75 at 0.45 MPa[3][4][6]
HDT at 1.8 MPa°C97–99 unannealed (ZYLtech, ISO 75 at 1.8 MPa; specimen type not stated); Spectrum 90 on injection-moulded specimens[2][1]65 (Polymaker) to 75 (PolyLite), ISO 75 at 1.8 MPa; Prusament 68[3][4][6]
Glass transition (Tg)°CNot documented71–81 (DSC)[4][5][6]
Melting point / Vicat°CAmorphous ASA matrix; Vicat 98 (Spectrum, ISO 306). ZYLtech quotes a 210–220 °C melting range by ISO 11357 for its grade[1][2]Amorphous — no melting point; Vicat 75–84 (ISO 306)[4][5][6]
Continuous service temperature°C93 — Prusa publishes this as the temperature resistance of Prusament ASA[35]61–66 — loaded bars begin to move at this temperature across six grades from four brands; Prusa publishes 68 for Prusament PETG[31][32][33][21][36]
Thermal expansion (CTE)µm/m·KNot documented65 at 30 °C (neat PETG, large-format printed bead, TMA)[37]
Flammability / UL 94Flammable; no UL 94 rating published[25]Flammable; no UL 94 rating published for standard PETG, though flame-retardant V0 grades exist[38][30]
Environment & Chemical
UV resistance1–5Excellent — designed for permanent outdoor use; Spectrum states the parts resist prolonged UV and moisture exposure[1][39]Moderate — a season or two[3]
Chemical resistanceGood against weak acids, weak alkalis, oils and grease; dissolved by acetone[26]Withstands acids, alkalis, oils and UV exposure — Polymaker names outdoor use as a result[30]
Water / humidity resistance in service1–5Not documentedGood — minor absorption[3]
Food contactNot food safe[18]PET is the polymer of drinks bottles, but printed layer grooves harbour bacteria and no filament here carries a food-contact certification[30]
Biodegradability / compostabilityNot biodegradable[18]Not biodegradable[30]
RecyclabilityNot accepted in household plastic collection[18]PET is widely recycled as bottle stock, but printed PETG waste is not accepted in household collection[30]
Health & Safety
Fume toxicity1–5High — hazardous VOC such as styrene; enclosure and filtration needed[40][17]Moderate — measurable VOCs and UFPs, ventilation advised[40]
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[40]
Hazardous species emittedStyrene. Bambu Lab states ABS and ASA release harmful gases such as styrene at printing temperature, which can be toxic and cause dizziness or nausea. Azimi et al. measured styrene from every styrenic filament tested but did not test ASA itself[17][40]Not documented
Ventilation / filtration requirement1–5Enclosure with carbon and HEPA filtration[40][17]Open a window / occasional ventilation[40]
Dust & fibre handling hazardGlass fibre is bound in the matrix; avoid inhaling sanding dust[1]Not documented
Post-Processing
Sanding & machiningSands well and takes filler before painting[18]Sands poorly — the material is tough and gums rather than powders[23]
Painting & finishingPaints readily; ASA holds colour outdoors so many parts are left unpainted[18]Paint adheres poorly without abrasion and a primer[3]
Gluing & solvent weldingSolvent-welds with acetone[26]Cyanoacrylate; no common solvent welds PETG cleanly[23]
Vapour / chemical smoothingAcetone vapour smoothing works[26]No practical vapour smoothing[3]
Support material pairingHIPS breaks away or dissolves in d-limonene; Bambu Lab sells a Support for ABS that also serves ASA[17]Prints its own supports; Polymaker rates PolyDissolve S1 for PETG[23]
Dimensional accuracy & detailNot documentedStringing and blobbing are the usual accuracy limits, not shrinkage[3][6]
Solvents & Solubility
Soluble inAcetone dissolves the resin and leaves the fibre; MEK, THF, ethyl acetate and chlorinated solvents attack the styrenic backbone.[41][26]No common workshop solvent; 1,2-dichloroethane destroys it inside a week and dichloromethane — a carcinogen — dissolves the surface.[42][43]
Softened or crazed byLimonene attacks some grades — Prusa reports Prusament ASA Orange flaking apart as layer adhesion fails.[44]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[42]
Solvent welding & smoothing agentAcetone vapour reaches only the resin fraction, so the fibre is left standing proud of the smoothed surface.[43][26]Dichloromethane brushed on is the only agent that smooths PETG — a controlled carcinogen, not workshop stock.[43]

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. Spectrum ASA-X GF10 Technical Data Sheet (mechanical and thermal data marked injection-moulded) Spectrum Filaments · 2026-08 · tds
  2. ZYLtech ASA-GF Filament Technical Data Sheet v1 ZYLtech · 2026-08 · 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. Filastruder product catalogue Filastruder · 2026-08 · vendor
  8. ZYLtech ASA-GF Glass Fiber filament — product page ZYLtech · 2026-08 · vendor
  9. PETG Basic — product page Bambu Lab US Store · 2026-08 · vendor
  10. Polymaker product catalogue Polymaker · 2026-08 · vendor
  11. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  12. Siraya Tech Fibreheart ASA-GF Filament product page Siraya Tech · 2026-08 · vendor
  13. Black PETG Filament 1.75 mm 1 kg — product data Hatchbox · 2026-08 · vendor
  14. IEMAI PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  15. CHCKX PETG 3D Printer Filament 1.75 mm 1 kg, Black CHCKX (Amazon US) · 2026-08 · vendor
  16. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  17. ABS / ASA / PC Usage Guide Bambu Lab Wiki · 2026-08 · doc
  18. ASA — material basics Polymaker Wiki · 2026-08 · doc
  19. ASA — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  20. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  21. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  22. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  23. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  24. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  25. Bambu Filament Technical Data Sheet V3.0 — ASA Bambu Lab · 2026-08 · tds
  26. PolyLite ASA Technical Data Sheet Polymaker · 2024-11 · tds
  27. Prusament ASA Technical Datasheet v1.1 Prusa Polymers · 2024-05 · tds
  28. Bambu Filament Technical Data Sheet — PETG HF Bambu Lab · 2026-08 · tds
  29. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  30. PETG — material basics Polymaker Wiki · 2026-08 · doc
  31. PCTG vs PETG comparison — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  32. Extrudr PETG vs PCTG vs XPETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  33. Prusament PETG-CF vs PETG V0 vs PETG — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  34. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  35. Prusament ASA — material page Prusa Polymers · 2026-08 · doc
  36. Prusament PETG — material page Prusa Polymers · 2026-08 · doc
  37. 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
  38. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  39. ASA — FDM Material Data Sheet (includes 1000 h QUV exposure results) Stratasys · 2026-08 · tds
  40. 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
  41. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  42. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  43. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  44. HIPS — Knowledge Base Prusa Research · 2026-08 · doc