Materials / Compare
FDM ASA vs. Plastic PEEK
Compare FDM ASA vs. Plastic PEEK 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) | 98MPasourcetypical, tensile yield |
| Ultimate tensile strength | 37MPasourcetypical | not sourced |
| Compressive strength | not sourced | 125MPasourcetypical, 23 C |
| Flexural strength | 65MPasourcetypical | 165MPasourcetypical, flexural stress at yield, 23 C |
| Elongation at break | 9.2%sourcetypical | 25%sourcetypical, at break |
| Young's modulus (stiffness) | 2.45GPasourcetypical | 4GPasourcetypical (nominal) |
| Density | 1,050kg/m³sourcetypical | 1,300kg/m³sourcetypical (crystalline) |
| Strength to weight | 35.2kN·m/kg | 75.4kN·m/kg2.14x higher |
| Stiffness to weight | 2.33MN·m/kg | 3.08MN·m/kg32% higher |
| Poisson's ratio | not sourced | 0.38sourcetypical |
| Shear modulus | not sourced | 1.45GPa |
| Bulk modulus | not sourced | 5.56GPa |
| Speed of sound | 1,528m/s | 1,754m/s |
| Thermal | ||
| Thermal conductivity | 0.17W/m·Ksourcebase material: INEOS Styrolution Luran S 777K injection-molding ASA, typical | 0.29W/m·Ksourcetypical, average, 23 C |
| Thermal expansion | 80–110µm/m·Ksourcebase material: INEOS Styrolution Luran S 777K injection-molding ASA, range | 55µm/m·Ksourceaverage of flow/cross-flow, below Tg (<143 C) |
| 100 mm part over a 50 °C swing | 475µm growth | 275µm growth1.73x less |
| Specific heat | not sourced | 2,200J/kg·Ksourcetypical, 23 °C, DSC (Victrex PEEK 450G TDS, revision Jul 2012) |
| Heats up and cools (diffusivity) | not sourced | 0.101mm²/s |
| Thermal shock resistance | not sourced | 80.1W/m |
| Melting point | not sourced | 343°Csourcetypical, DSC |
| Glass transition | not sourced | 143°Csourceonset (midpoint 150 C) |
| Max service temperature | 92°CsourceHDT 1.8 MPa | 240°CsourceUL 746B RTI, mechanical strength (continuous use index) |
| 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. | Victrex PEEK 450G (unreinforced, injection moulded), Victrex TDS rev. March 2026; Poisson from Victrex fluid-management flyer (2020-07) |
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 is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is FDM ASA stronger than Plastic PEEK?
Plastic PEEK is stronger: its yield strength is 98 MPa against tensile strength 37 MPa for FDM ASA (2.65x).
Which is lighter, FDM ASA or Plastic PEEK?
FDM ASA is lighter: 1,050 kg/m³ against 1,300 kg/m³ for Plastic PEEK.
Which is stiffer, FDM ASA or Plastic PEEK?
Plastic PEEK is stiffer: Young's modulus 4 GPa against 2.45 GPa for FDM ASA, so the same part in Plastic PEEK deflects less under the same load.
Which is lighter for the same job, FDM ASA or Plastic PEEK?
For the same stiffness or strength: FDM ASA is lighter for a stiff panel or plate; Plastic PEEK is lighter for a stiff rod or tie (tension), stiff beam (bending), strong rod or tie, strong beam, strong panel or plate.
| Part that must be | FDM ASA | Plastic PEEK |
|---|---|---|
| Stiff rod or tie (tension) | 32% heavier | lighter |
| Stiff beam (bending) | 3% heavier | lighter |
| Stiff panel or plate | lighter | 5% heavier |
| Strong rod or tie | 2.14x heavier | lighter |
| Strong beam | 1.55x heavier | lighter |
| Strong panel or plate | 31% heavier | lighter |
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 conducts heat better, FDM ASA or Plastic PEEK?
Plastic PEEK conducts heat better: 0.29 W/m·K against 0.17 W/m·K for FDM ASA.
Which expands less with temperature?
Plastic PEEK expands less: 55 µm/m·K against 95 µm/m·K for FDM ASA.