Materials / Compare
FDM ASA vs. Plastic PETG
Compare FDM ASA vs. Plastic PETG strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | 46.2MPasourcetypical |
| Ultimate tensile strength | 37MPasourcetypical | 46.2MPasourcetypical, peak stress (= stress at yield) |
| Flexural strength | 65MPasourcetypical | 78.9MPasourcetypical21% stronger in bending |
| Elongation at break | 9.2%sourcetypical21% more ductile | 7.6%sourcetypical |
| Young's modulus (stiffness) | 2.45GPasourcetypical26% stiffer | 1.94GPasourcetypical |
| Density | 1,050kg/m³sourcetypical21% lighter | 1,270kg/m³sourcetypical |
| Strength to weight | 35.2kN·m/kg | 36.4kN·m/kg3% higher |
| Stiffness to weight | 2.33MN·m/kg1.53x higher | 1.53MN·m/kg |
| Poisson's ratio | not sourced | not sourced |
| Shear modulus | not sourced | not sourced |
| Bulk modulus | not sourced | not sourced |
| Speed of sound | 1,528m/s | 1,236m/s |
| Thermal | ||
| Thermal conductivity | 0.17W/m·Ksourcebase material: INEOS Styrolution Luran S 777K injection-molding ASA, typical | 0.21W/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| Thermal expansion | 80–110µm/m·Ksourcebase material: INEOS Styrolution Luran S 777K injection-molding ASA, range | 51µm/m·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), typical |
| 100 mm part over a 50 °C swing | 475µm growth | 255µm growth1.86x less |
| Specific heat | not sourced | 1,300J/kg·Ksourcebase material: Eastman Eastar Copolyester 6763 (PETG), DSC at 60 °C (lowest temperature listed) |
| Heats up and cools (diffusivity) | not sourced | 0.127mm²/s |
| Thermal shock resistance | not sourced | not sourced |
| Glass transition | not sourced | 77.4°Csourcetypical |
| Max service temperature | 92°CsourceHDT 1.8 MPa | 76.2°CsourceHDT 0.455 MPa (printed specimens) |
| Values for | Bambu Lab ASA, TDS V3.0, printed specimens X-Y; nozzle 260 °C, bed 80 °C, 200 mm/s, 100% infill; annealed and dried 80 °C for 12 h before testing. | Ultimaker PETG, 3D-printed specimens, XY (flat); Ultimaker S5 Pro, engineering intent profile, 0.15 mm layer height, AA 0.4 print core, 100% infill, Cura 4.9, printed one-at-a-time, conditioned >=24 h at room temperature. TDS v1.00, April 29, 2022. |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
FDM ASA and Plastic PETG are 3D printed: their properties depend on build direction and print settings; these are typical values.
Questions
Is FDM ASA stronger than Plastic PETG?
Plastic PETG is stronger: its yield strength is 46.2 MPa against tensile strength 37 MPa for FDM ASA (25%).
Which is lighter, FDM ASA or Plastic PETG?
FDM ASA is lighter: 1,050 kg/m³ against 1,270 kg/m³ for Plastic PETG.
Which is stiffer, FDM ASA or Plastic PETG?
FDM ASA is stiffer: Young's modulus 2.45 GPa against 1.94 GPa for Plastic PETG, so the same part in FDM ASA deflects less under the same load.
Which is lighter for the same job, FDM ASA or Plastic PETG?
For the same stiffness or strength: FDM ASA is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong beam, strong panel or plate; Plastic PETG is lighter for a strong rod or tie.
| Part that must be | FDM ASA | Plastic PETG |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 1.53x heavier |
| Stiff beam (bending) | lighter | 36% heavier |
| Stiff panel or plate | lighter | 31% heavier |
| Strong rod or tie | 3% heavier | lighter |
| Strong beam | lighter | 4% heavier |
| Strong panel or plate | lighter | 8% heavier |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which is more ductile, FDM ASA or Plastic PETG?
FDM ASA stretches further before it breaks: 9.2% elongation at break against 7.6% for Plastic PETG.
Which conducts heat better, FDM ASA or Plastic PETG?
Plastic PETG conducts heat better: 0.21 W/m·K against 0.17 W/m·K for FDM ASA.
Which expands less with temperature?
Plastic PETG expands less: 51 µm/m·K against 95 µm/m·K for FDM ASA.