FDM ASA vs. Plastic PEEK

Q: 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).

Q: Which is lighter, FDM ASA or Plastic PEEK?

FDM ASA is lighter: 1,050 kg/m³ against 1,300 kg/m³ for Plastic PEEK.

Q: 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.

Q: 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.

Q: 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.

Q: Which expands less with temperature?

Plastic PEEK expands less: 55 µm/m·K against 95 µm/m·K for FDM ASA.

Compare FDM ASA vs. Plastic PEEK strength, stiffness, weight and thermal properties.

Change either side

FDM ASA3D printed (FDM)

Plastic PEEKBulk polymer (molded or machined)

Mechanical
Try it on a partA bracket to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
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?