BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C.
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 Plastic PBT GF30 stronger than Plastic TPU?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against 23.7 MPa for Plastic TPU (5.91x).
Which is lighter, Plastic PBT GF30 or Plastic TPU?
Plastic TPU is lighter: 1,220 kg/m³ against 1,530 kg/m³ for Plastic PBT GF30.
Which is stiffer, Plastic PBT GF30 or Plastic TPU?
Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 0.067 GPa for Plastic TPU, so the same part in Plastic PBT GF30 deflects less under the same load.
Which is lighter for the same job, Plastic PBT GF30 or Plastic TPU?
For the same stiffness or strength: Plastic PBT GF30 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
Plastic PBT GF30
Plastic TPU
Stiff rod or tie (tension)
lighter
117x heavier
Stiff beam (bending)
lighter
9.64x heavier
Stiff panel or plate
lighter
4.2x heavier
Strong rod or tie
lighter
4.71x heavier
Strong beam
lighter
2.61x heavier
Strong panel or plate
lighter
1.94x 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).