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
1,908m/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
Bambu Lab PAHT-CF, TDS V3.0, printed specimens X-Y, dry state; nozzle 290 °C, bed 100 °C, 100 mm/s, 100% infill; annealed and dried 80 °C for 12 h before testing.
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.
FDM PAHT-CF is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is FDM PAHT-CF stronger than Rubber?
FDM PAHT-CF is stronger: its tensile strength is 92 MPa against 23 MPa for Rubber (4x).
Which is lighter, FDM PAHT-CF or Rubber?
Rubber is lighter: 960 kg/m³ against 1,060 kg/m³ for FDM PAHT-CF.
Which is lighter for the same job, FDM PAHT-CF or Rubber?
For the same stiffness or strength: FDM PAHT-CF is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
FDM PAHT-CF
Rubber
Strong rod or tie
lighter
3.62x heavier
Strong beam
lighter
2.28x heavier
Strong panel or plate
lighter
1.81x 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).
Which is more ductile, FDM PAHT-CF or Rubber?
Rubber stretches further before it breaks: 830% elongation at break against 8.4% for FDM PAHT-CF.