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).
Shear modulus
not sourced
not sourced
Bulk modulus
not sourced
not sourced
Speed of sound
234m/s
not sourced
Thermal
Thermal conductivity
not sourced
0.151W/m·Ksourcegovernment selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C
Thermal expansion
not sourced
not sourced
100 mm part over a 50 °C swing
not sourced
not sourced
Specific heat
not sourced
1,881J/kg·Ksourcegovernment (NBS J. Res. 68A, Table 7; values observed for unvulcanized NR by Bekkedahl and Matheson), 25 °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 is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Plastic TPU stronger than Rubber?
Plastic TPU is stronger: its tensile strength is 23.7 MPa against 23 MPa for Rubber (3%).
Which is lighter, Plastic TPU or Rubber?
Rubber is lighter: 960 kg/m³ against 1,220 kg/m³ for Plastic TPU.
Which is lighter for the same job, Plastic TPU or Rubber?
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
Plastic TPU
Rubber
Strong rod or tie
23% heavier
lighter
Strong beam
25% heavier
lighter
Strong panel or plate
25% 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).