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.
Formlabs Elastic 50A Resin V2 (FLELCL02), TDS Rev. 01 24.01.2024; parts printed on Form 3, 100 µm, Elastic 50A V2 settings and post-processing; tensile on Die C specimens cut from printed sheets after 3+ h at 23 °C.
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.
Plastic TPU and SLA Resin Elastic 50A are 3D printed: their properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic TPU stronger than SLA Resin Elastic 50A?
Plastic TPU is stronger: its tensile strength is 23.7 MPa against 3.4 MPa for SLA Resin Elastic 50A (6.97x).
Which is lighter, Plastic TPU or SLA Resin Elastic 50A?
SLA Resin Elastic 50A is lighter: 1,010 kg/m³ against 1,220 kg/m³ for Plastic TPU.
Which is lighter for the same job, Plastic TPU or SLA Resin Elastic 50A?
For the same stiffness or strength: Plastic TPU is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Plastic TPU
SLA Resin Elastic 50A
Strong rod or tie
lighter
5.77x heavier
Strong beam
lighter
3.02x heavier
Strong panel or plate
lighter
2.19x 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).