C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values
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.
Plastic TPU is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Brass C360 stronger than Plastic TPU?
Brass C360 is stronger: its yield strength is 310 MPa against tensile strength 23.7 MPa for Plastic TPU (13.1x).
Which is lighter, Brass C360 or Plastic TPU?
Plastic TPU is lighter: 1,220 kg/m³ against 8,498 kg/m³ for Brass C360.
Which is stiffer, Brass C360 or Plastic TPU?
Brass C360 is stiffer: Young's modulus 96.5 GPa against 0.067 GPa for Plastic TPU, so the same part in Brass C360 deflects less under the same load.
Which is lighter for the same job, Brass C360 or Plastic TPU?
For the same stiffness or strength: Brass C360 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie; Plastic TPU is lighter for a strong beam, strong panel or plate.
Part that must be
Brass C360
Plastic TPU
Stiff rod or tie (tension)
lighter
207x heavier
Stiff beam (bending)
lighter
5.45x heavier
Stiff panel or plate
lighter
1.62x heavier
Strong rod or tie
lighter
1.88x heavier
Strong beam
25% heavier
lighter
Strong panel or plate
1.93x 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).