Ceramic Alumina 96% vs. Rubber

Compare Ceramic Alumina 96% vs. Rubber strength, stiffness, weight and thermal properties.

Change either side

Ceramic Alumina 96%Sintered ceramic (pressed and fired)

RubberBulk polymer (molded or machined)

Mechanical
Try it on a partA sample part to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
Yield strength	not given (tensile used)	not given (tensile used)
Ultimate tensile strength	221MPasourcetypical tensile strength, 25 °C (ACMA Test #4)	23MPasourcetypical
Compressive strength	2,068MPasourcetypical, 20 °C (ASTM-C773)	not sourced
Flexural strength	358MPasourceflexural strength (MOR), 20 °C (ASTM-F417)	not sourced
Elongation at break	not sourced	830%sourcetypical
Young's modulus (stiffness)	303GPasourcetypical, 20 °C (ASTM-C848)	not sourced
Density	3,720kg/m³sourcetypical (ASTM-C20)	960kg/m³sourcetypical (specific gravity)
Strength to weight	59.4kN·m/kg2.48x higher	24kN·m/kg
Stiffness to weight	81.5MN·m/kg	not sourced
Poisson's ratio	0.21sourcetypical, 20 °C (ASTM-C848)	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	125GPa	not sourced
Bulk modulus	174GPa	not sourced
Speed of sound	9,025m/s	not sourced
Thermal
Thermal conductivity	24.7W/m·Ksourcetypical, 20 °C (ASTM-C408)	0.151W/m·Ksourcegovernment selected value (US Army Natick Laboratories TR 66-49-PR, 1966), soft vulcanized natural rubber, 25 °C
Thermal expansion	8.2µm/m·Ksourcemean, 25-1000 °C (ASTM-C372)	not sourced
100 mm part over a 50 °C swing	41µm growth	not sourced
Specific heat	880J/kg·Ksourcetypical, 100 °C (ASTM-E1269)	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)	7.55mm²/s90.2x faster	0.0836mm²/s
Thermal shock resistance	1,736W/m	not sourced
Max service temperature	not sourced	70°Csourcecontinuous use operating range
Values for	CoorsTek AD-96, nominal 96% Al2O3 sintered alumina, typical values; CoorsTek "Ceramic Seal Material Properties" (© 2018, 01899 F). AD-96 is the general 96% grade, not the ADS-96R substrate grade.	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 Ceramic Alumina 96% stronger than Rubber?

Ceramic Alumina 96% is stronger: its tensile strength is 221 MPa against 23 MPa for Rubber (9.61x).

Which is lighter, Ceramic Alumina 96% or Rubber?

Rubber is lighter: 960 kg/m³ against 3,720 kg/m³ for Ceramic Alumina 96%.

Which is lighter for the same job, Ceramic Alumina 96% or Rubber?

For the same stiffness or strength: Ceramic Alumina 96% is lighter for a strong rod or tie, strong beam; Rubber is lighter for a strong panel or plate.

Part that must be	Ceramic Alumina 96%	Rubber
Strong rod or tie	lighter	2.48x heavier
Strong beam	lighter	17% heavier
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).

Which conducts heat better, Ceramic Alumina 96% or Rubber?

Ceramic Alumina 96% conducts heat better: 24.7 W/m·K against 0.151 W/m·K for Rubber.

Among 72 materials

Stiffness against density

Strength against density