3D Printing Info

Filament comparison

ASA-GF vs PET-CF

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

Glass-fibre ASA (ASA-GF) guideCarbon-fibre PET (PET-CF) guide

2 selected · all documented properties

Open these two in the interactive comparisonMore ASA-GF comparisonsMore PET-CF comparisons
ASA-GF vs PET-CF — documented properties and sources
PropertyGlass-fibre ASA (ASA-GF)ASACarbon-fibre PET (PET-CF)PETG
Market snapshot
Listing priceUSD/kg; dated snapshots$29.95/kg median; $26.99–$33.99/kg across 3 dated product listings$39.99/kg median; $26.00–$49.98/kg across 4 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]Semi-crystalline PET reinforced with carbon fibre — a different polymer from PETG-CF, with the glycol modifier removed so the matrix can crystallise[3][4]
Densityg/cm³1.07 (ZYLtech) and 1.11 (Spectrum), ISO 1183[1][2]1.29 (Bambu Lab) and 1.34 (Fiberon PET-CF17), ISO 1183[3][4]
Typical priceUSD/kg1 kg spools cluster near 28[5][6]1 kg spools cluster near 45[3][7]
Price range across brandsUSD/kg27–34 across brands; Ambrosia 27, ZYLtech 30, Siraya Tech 34[5][6][8]26–50 across brands; ELEGOO 26 in a 5 kg pack, Bambu Lab 45, Fiberon 50[9][3][7]
Market availability1–5Niche, a handful of specialist brands[5][1][2]Available from several mainstream brands[3][7][9]
Spool sizes & diameters1.75 and 2.85 mm; 1 kg spools[2][5]1.75 mm; 0.5 and 1 kg spools[7][3]
Typical applicationsOutdoor brackets and mounts that need stiffness and dimensional stability under sun and moisture[1][2]Load-bearing parts that must survive above PETG's 70 °C ceiling without moving to PA or PC[3][4]
Diameter tolerance± mm±0.01 at 95 % probability and ±0.02 at 100 % (ZYLtech)[2]Not documented
Printing Parameters
Nozzle temperature°C240–270 (Spectrum); 240–280 (ZYLtech)[1][2]260–290 (Bambu Lab)[3]
Bed temperature°C80–100 (Spectrum); 90–110 on PEI (ZYLtech)[1][2]80–100 (Bambu Lab)[3]
Enclosure / chamber requirement1–5Enclosure recommended[10]Enclosure recommended — Bambu Lab specifies a 45–60 °C chamber[3]
Recommended chamber temperature°CNot documented45–60 (Bambu Lab)[3]
Part cooling fan0–20 % (Spectrum)[1]0–60 % (Bambu Lab)[3]
Bed surface & adhesion aidPEI sheet, BuildTak or an adhesion aid such as Magigoo (Polymaker); Simplify3D also lists Kapton tape and ASA slurry[11][12]Textured PEI, satin or powder-coated sheets; on smooth PEI a glue stick acts as a release agent[13][14]
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][15]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[3][15]
Warping tendency1–5Moderate — needs adhesion aid or draught shield[10]Not documented
Bed-adhesion difficulty1–5Needs a specific surface plus adhesive[11]Needs the right surface or a thin adhesive — the problem is releasing the part, not sticking it[13][14]
Stringing / oozing tendency1–5Slight — Polymaker advises 1–2 mm retraction at 20–30 mm/s[11]Moderate — retraction tuning needed; Polymaker names stringing as PETG's common quirk[14]
Overall printing difficulty1–5Intermediate — dry filament and a tuned profile; ZYLtech requires a hardened nozzle of 0.6 mm or larger[2][1]Advanced — enclosure, hardware upgrades, tuning[3]
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]Hardened steel required[3]
Abrasiveness1–5Highly abrasive — standard GF composite[1][2]Highly abrasive — standard CF composite[3]
Nozzle clog risk1–5Moderate — needs dry filament and a clean nozzle; Prusa lists higher risk of nozzle clogging for glass-filled composites[16]Moderate — needs dry filament and a clean nozzle; Prusa lists higher risk of nozzle clogging for carbon-filled composites[16]
Heat-creep / jam sensitivity1–5Slightly sensitive[12]Slightly sensitive[17]
Hotend requirementNo special hotend required[12]No special hot-end required[17]
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[18][19][20]Moderate — 0.37 % saturated at 25 °C / 55 % RH (Bambu Lab); 0.53 % equilibrium (Fiberon)[3][4]
Equilibrium moisture content at ~50 % RH%Not documented0.37 saturated at 25 °C / 55 % RH (Bambu Lab); 0.53 equilibrium (Fiberon PET-CF17)[3][4]
Drying temperature & timeNot documented80 °C for 8–12 h (Bambu Lab) — the longest and hottest dry in the polyester family; Fiberon specifies 100 °C for 10 h[3][4]
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface[21]Bubbling and popping at the nozzle, stringing and a rough surface[21]
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[21]Bambu Lab publishes its whole mechanical table under the heading "Mechanical Properties (Dry state)" — the quoted figures apply only to dried filament[3]
Storage requirementSealed with desiccant; Polymaker rates the styrenics moderate-sensitivity[21]Sealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[21][14]
Hydrolysis at melt temperatureNot documentedThe 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[3][4]
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]65.9 (Fiberon) to 74 (Bambu Lab) printed XY, ISO 527[3][4]
Young's modulusMPa2540–2890 (ZYLtech; specimen type not stated) and 2550 (Spectrum, injection-moulded), ISO 527[2][1]4730 ± 260 (Bambu Lab) and 5481 ± 224 (Fiberon) printed XY, ISO 527[3][4]
Elongation at break%3.4 at break (ZYLtech; specimen type not stated); Spectrum quotes 2.80 at yield on injection-moulded specimens[2][1]2.4 ± 0.5 printed XY, ISO 527 (Fiberon PET-CF17)[4]
Flexural strengthMPaNot documented109.3 ± 2.0 printed XY, ISO 178 (Fiberon PET-CF17)[4]
Flexural modulusMPa2130–2480 flexural modulus, ISO 178 (ZYLtech; specimen type not stated)[2]4744 ± 136 printed XY, ISO 178 (Fiberon PET-CF17)[4]
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]5.1 ± 0.2 printed XY, ISO 179 notched (Fiberon PET-CF17); unnotched 25.1 ± 2.8[4]
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]Not documented
Layer adhesion / Z tensileMPaNot documented27.9 (Fiberon) and 35 ± 5 (Bambu Lab) printed Z, ISO 527[3][4]
Brittleness1–5Brittle — snaps with little warning; elongation at break 3.4 %[2]Very brittle — elongation at break 2.4 % in XY and 0.8 % in Z[4]
Creep resistance / sustained load1–5Good — no creep test found; chopped glass fibre lifts modulus to 2540–2890 against 2379–2450 for unfilled ASA[2][19][18]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[4][3]
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][19][18]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[4]
Elasticity / flexibility1–5Rigid[2]Rigid[3]
Z strength as % of XY%Not documented42 (Fiberon) to 47 (Bambu Lab), printed[3][4]
Thermal Properties
HDT at 0.45 MPa°C100 (Spectrum, injection-moulded, ISO 75 at 0.45 MPa)[1]147.5 (Fiberon) and 205 (Bambu Lab), ISO 75 at 0.45 MPa[3][4]
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]105 (Fiberon) and 182 (Bambu Lab), ISO 75 at 1.8 MPa[3][4]
Glass transition (Tg)°CNot documented75 (Bambu Lab) and 79.3 (Fiberon), DSC[3][4]
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]241.3 (Fiberon) and 250 (Bambu Lab) melting, DSC; Vicat 226–238[3][4]
Continuous service temperature°C93 — Prusa publishes this as the temperature resistance of Prusament ASA[22]Not documented
Annealing responseNot documentedThe PET matrix crystallises on annealing, which is what separates this grade from PETG-CF[4][3]
Flammability / UL 94Flammable; no UL 94 rating published[18]Flammable; no UL 94 rating published for standard grades[23]
Environment & Chemical
UV resistance1–5Excellent — designed for permanent outdoor use; Spectrum states the parts resist prolonged UV and moisture exposure[1][24]Not documented
Chemical resistanceGood against weak acids, weak alkalis, oils and grease; dissolved by acetone[19]Withstands acids, alkalis, oils and UV exposure[14]
Food contactNot food safe[11]Not certified for food contact as filament[14]
Biodegradability / compostabilityNot biodegradable[11]Not biodegradable[14]
RecyclabilityNot accepted in household plastic collection[11]Not accepted in household plastic collection[14]
Electrical & ESD propertiesNot documentedSurface resistivity above 10¹² ohm — insulating (Fiberon PET-CF17, ANSI/ESD S11.11)[4]
Health & Safety
Fume toxicity1–5High — hazardous VOC such as styrene; enclosure and filtration needed[25][10]Moderate — measurable VOCs and UFPs, ventilation advised[25]
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[10][25]Not documented
Ventilation / filtration requirement1–5Enclosure with carbon and HEPA filtration[25][10]Ventilated room or enclosure recommended[25][3]
Dust & fibre handling hazardGlass fibre is bound in the matrix; avoid inhaling sanding dust[1]Carbon fibre is bound in the matrix; sanding dust should not be inhaled[4]
Post-Processing
Sanding & machiningSands well and takes filler before painting[11]Sands poorly — the material is tough and gums rather than powders[17]
Painting & finishingPaints readily; ASA holds colour outdoors so many parts are left unpainted[11]Not documented
Gluing & solvent weldingSolvent-welds with acetone[19]Cyanoacrylate; no common solvent welds PETG cleanly[17]
Vapour / chemical smoothingAcetone vapour smoothing works[19]No practical vapour smoothing[17]
Support material pairingHIPS breaks away or dissolves in d-limonene; Bambu Lab sells a Support for ABS that also serves ASA[10]Prints its own supports; Polymaker rates PolyDissolve S1 for PETG[17]
Dimensional accuracy & detailNot documentedBambu Lab markets it on low warping and shrinkage relative to other high-temperature composites[3]
Solvents & Solubility
Soluble inAcetone dissolves the resin and leaves the fibre; MEK, THF, ethyl acetate and chlorinated solvents attack the styrenic backbone.[26][19]None common; fluorinated solvents such as hexafluoroisopropanol dissolve linear polyester at 23 °C. Laboratory only.[27][26]
Softened or crazed byLimonene attacks some grades — Prusa reports Prusament ASA Orange flaking apart as layer adhesion fails.[28]Ensinger rates polyester not resistant to chloroform or dichloromethane and only conditionally resistant to acetone and MEK.[26]
Solvent welding & smoothing agentAcetone vapour reaches only the resin fraction, so the fibre is left standing proud of the smoothed surface.[29][19]Dichloromethane attacks polyester and can be brushed on, but the carbon fibre blocks any useful surface flow.[26][29]

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. Bambu Filament Technical Data Sheet — PET-CF Bambu Lab · 2026-08 · tds
  4. Fiberon PET-CF17 Technical Data Sheet V1.0 Polymaker · 2026-08 · tds
  5. Filastruder product catalogue Filastruder · 2026-08 · vendor
  6. ZYLtech ASA-GF Glass Fiber filament — product page ZYLtech · 2026-08 · vendor
  7. Polymaker product catalogue Polymaker · 2026-08 · vendor
  8. Siraya Tech Fibreheart ASA-GF Filament product page Siraya Tech · 2026-08 · vendor
  9. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  10. ABS / ASA / PC Usage Guide Bambu Lab Wiki · 2026-08 · doc
  11. ASA — material basics Polymaker Wiki · 2026-08 · doc
  12. ASA — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  13. Prusament PETG Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  14. PETG — material basics Polymaker Wiki · 2026-08 · doc
  15. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  16. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  17. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  18. Bambu Filament Technical Data Sheet V3.0 — ASA Bambu Lab · 2026-08 · tds
  19. PolyLite ASA Technical Data Sheet Polymaker · 2024-11 · tds
  20. Prusament ASA Technical Datasheet v1.1 Prusa Polymers · 2024-05 · tds
  21. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  22. Prusament ASA — material page Prusa Polymers · 2026-08 · doc
  23. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  24. ASA — FDM Material Data Sheet (includes 1000 h QUV exposure results) Stratasys · 2026-08 · tds
  25. 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
  26. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  27. Resistance of Ultramid, Ultraform and Ultradur to chemicals (TI-KTU/AS-28 e) BASF · 2000-10 · tds
  28. HIPS — Knowledge Base Prusa Research · 2026-08 · doc
  29. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc