Materials / Rubber
Rubber strength, stiffness, density and thermal properties, with their source.
A bracket in Rubber, smooth finish.
Process Bulk polymer (molded or machined) Mechanical Yield strength not given (tensile used) Ultimate tensile strength 23 MPa source typical Elongation at break 830 % source typical Young's modulus (stiffness) not sourced Density 960 kg/m³ source typical (specific gravity) Strength to weight 24 kN·m/kg Stiffness to weight not sourced Poisson's ratio 0.5 source government (NBS J. Res. 68A, 1964): computed by NBS for peroxide-cured gum NR vulcanizate, 25 °C, infinitesimal deformation 0.49 in the solver: the linear element locks as the ratio nears 0.5 (nearly incompressible). Shear modulus not sourced Bulk modulus not sourced Speed of sound not sourced Thermal Thermal conductivity 0.151 W/m·K source government selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C Thermal expansion not sourced 100 mm part over a 50 °C swing not sourced Specific heat 1,881 J/kg·K source government (NBS J. Res. 68A, Table 7; values observed for unvulcanized NR by Bekkedahl and Matheson), 25 °C Heats up and cools (diffusivity) 0.0836 mm²/s Thermal shock resistance not sourced Max service temperature 70 °C source continuous use operating range Values for Weir Minerals Linatex Premium rubber (95 % natural rubber), typical physical properties, spec sheet WMD0118/202305
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