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 TPU 95A, 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 (file v5.00), 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 TPU are 3D printed: their properties depend on build direction and print settings; these are typical values.
Questions
Is FDM ASA stronger than Plastic TPU?
FDM ASA is stronger: its tensile strength is 37 MPa against 23.7 MPa for Plastic TPU (1.56x).
Which is lighter, FDM ASA or Plastic TPU?
FDM ASA is lighter: 1,050 kg/m³ against 1,220 kg/m³ for Plastic TPU.
Which is stiffer, FDM ASA or Plastic TPU?
FDM ASA is stiffer: Young's modulus 2.45 GPa against 0.067 GPa for Plastic TPU, so the same part in FDM ASA deflects less under the same load.
Which is lighter for the same job, FDM ASA or Plastic TPU?
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 rod or tie, strong beam, strong panel or plate.
Part that must be
FDM ASA
Plastic TPU
Stiff rod or tie (tension)
lighter
42.5x heavier
Stiff beam (bending)
lighter
7.03x heavier
Stiff panel or plate
lighter
3.86x heavier
Strong rod or tie
lighter
1.81x heavier
Strong beam
lighter
1.56x heavier
Strong panel or plate
lighter
45% 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).