0.5sourcegovernment (NBS J. Res. 68A, 1964): computed by NBS for peroxide-cured gum NR vulcanizate, 25 °C, infinitesimal deformation0.49 in the solver: the linear element locks as the ratio nears 0.5 (nearly incompressible).
not sourced
Shear modulus
not sourced
not sourced
Bulk modulus
not sourced
not sourced
Speed of sound
not sourced
234m/s
Thermal
Thermal conductivity
0.151W/m·Ksourcegovernment selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C
not sourced
Thermal expansion
not sourced
not sourced
100 mm part over a 50 °C swing
not sourced
not sourced
Specific heat
1,881J/kg·Ksourcegovernment (NBS J. Res. 68A, Table 7; values observed for unvulcanized NR by Bekkedahl and Matheson), 25 °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 Rubber stronger than Plastic TPU?
Plastic TPU is stronger: its tensile strength is 23.7 MPa against 23 MPa for Rubber (3%).
Which is lighter, Rubber or Plastic TPU?
Rubber is lighter: 960 kg/m³ against 1,220 kg/m³ for Plastic TPU.
Which is lighter for the same job, Rubber or Plastic TPU?
For the same stiffness or strength: Rubber is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Rubber
Plastic TPU
Strong rod or tie
lighter
23% heavier
Strong beam
lighter
25% heavier
Strong panel or plate
lighter
25% 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).