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
not sourced
not sourced
Thermal
Thermal conductivity
0.92–1.12W/m·Ksourcerange for 130 lb/ft3 face brick (ASHRAE 2013 via BIA)
0.151W/m·Ksourcegovernment selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C
Thermal expansion
7.2µm/m·KsourceTMS Code average coefficient, clay/shale unit masonry
not sourced
100 mm part over a 50 °C swing
36µm growth
not sourced
Specific heat
837J/kg·Ksourcevalue used in BIA heat-capacity sample calculation
1,881J/kg·Ksourcegovernment (NBS J. Res. 68A, Table 7; values observed for unvulcanized NR by Bekkedahl and Matheson), 25 °C
Solid extruded clay/shale brick units (BIA 1993 manufacturer survey, TN 3A 2024); face brick of 130 lb/ft3 for thermal properties (BIA TN 4, from ASHRAE 2013); CTE is the TMS Code value for clay/shale masonry
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.
Questions
Is Brick stronger than Rubber?
Rubber is stronger: its tensile strength is 23 MPa against 5.1 MPa for Brick (4.51x).
Which is lighter, Brick or Rubber?
Rubber is lighter: 960 kg/m³ against 2,082 kg/m³ for Brick.
Which is lighter for the same job, Brick 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
Brick
Rubber
Strong rod or tie
9.78x heavier
lighter
Strong beam
5.92x heavier
lighter
Strong panel or plate
4.61x 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).
Which conducts heat better, Brick or Rubber?
Brick conducts heat better: 1.02 W/m·K against 0.151 W/m·K for Rubber.