Brass C360 vs. Rubber

Compare Brass C360 vs. Rubber strength, stiffness, weight and thermal properties.

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RubberBulk polymer (molded or machined)

Mechanical
Try it on a partA bracket to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
Yield strength	310MPasourcetypical, 0.5% extension under load	not given (tensile used)
Ultimate tensile strength	400MPasourcetypical17.4x stronger	23MPasourcetypical
Elongation at break	25%sourcetypical, 1 in. rod	830%sourcetypical
Young's modulus (stiffness)	96.5GPasourcetypical, temper-independent	not sourced
Density	8,498kg/m³sourcenominal	960kg/m³sourcetypical (specific gravity)
Strength to weight	36.5kN·m/kg1.52x higher	24kN·m/kg
Stiffness to weight	11.4MN·m/kg	not sourced
Poisson's ratio	0.34sourcebase material: leaded free-machining brass CuZn39Pb2 (C37700), Wieland-Z30 rolled products, reference value at room temperature	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	36GPa	not sourced
Bulk modulus	101GPa	not sourced
Speed of sound	3,370m/s	not sourced
Thermal
Thermal conductivity	116W/m·Ksourcetypical, 20 °C	0.151W/m·Ksourcegovernment selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C
Thermal expansion	20.5µm/m·Ksourcetypical, mean 20-300 °C	not sourced
100 mm part over a 50 °C swing	103µm growth	not sourced
Specific heat	377J/kg·Ksourcetypical, 20 °C	1,881J/kg·Ksourcegovernment (NBS J. Res. 68A, Table 7; values observed for unvulcanized NR by Bekkedahl and Matheson), 25 °C
Heats up and cools (diffusivity)	36.2mm²/s433x faster	0.0836mm²/s
Thermal shock resistance	11,997W/m	not sourced
Melting point	888–899°Csourcesolidus-liquidus	not sourced
Max service temperature	not sourced	70°Csourcecontinuous use operating range
Values for	C36000 free-cutting brass, H02 half-hard rod 1 in. section (20% cold work), copper.org typical values	Weir Minerals Linatex Premium rubber (95 % natural rubber), typical physical properties, spec sheet WMD0118/202305

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 Brass C360 stronger than Rubber?

Brass C360 is stronger: its yield strength is 310 MPa against tensile strength 23 MPa for Rubber (13.5x).

Which is lighter, Brass C360 or Rubber?

Rubber is lighter: 960 kg/m³ against 8,498 kg/m³ for Brass C360.

Which is lighter for the same job, Brass C360 or Rubber?

For the same stiffness or strength: Brass C360 is lighter for a strong rod or tie; Rubber is lighter for a strong beam, strong panel or plate.

Part that must be	Brass C360	Rubber
Strong rod or tie	lighter	1.52x heavier
Strong beam	1.56x heavier	lighter
Strong panel or plate	2.41x 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, Brass C360 or Rubber?

Brass C360 conducts heat better: 116 W/m·K against 0.151 W/m·K for Rubber.

Among 59 materials

Stiffness against density

Strength against density