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Low Expansion Glass-ceramic vs. Alumina

Low expansion glass-ceramic belongs to the glass and glass-ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is low expansion glass-ceramic and the bottom bar is alumina.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
220 to 370
Flexural Strength, MPa 35
260 to 430
Knoop Hardness 530
960 to 1660
Poisson's Ratio 0.22
0.22 to 0.24
Tensile Strength: Ultimate (UTS), MPa 53
210 to 290

Thermal Properties

Maximum Temperature: Mechanical, °C 690
650 to 1730
Specific Heat Capacity, J/kg-K 800
870 to 940
Thermal Conductivity, W/m-K 1.5
14 to 30
Thermal Expansion, µm/m-K 1.7
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.7
7.8 to 11
Electrical Resistivity Order of Magnitude, 10x Ω-m 11
6.2 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.4
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 19
35 to 53
Stiffness to Weight: Bending, points 59
57 to 62
Strength to Weight: Axial, points 6.1
14 to 23
Strength to Weight: Bending, points 13
19 to 28
Thermal Diffusivity, mm2/s 0.76
3.7 to 10
Thermal Shock Resistance, points 28
4.9 to 14