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Low Expansion Glass-ceramic vs. Hafnia

Low expansion glass-ceramic belongs to the glass and glass-ceramics classification, while hafnia belongs to the oxide-based engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

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

Low Expansion Glass-CeramicHafnia (Hafnium Oxide, HfO2)
Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.4
9.7
Elastic (Young's, Tensile) Modulus, GPa 83
57
Electrical Resistivity Order of Magnitude, 10x Ω-m 11
9.0
Maximum Temperature: Mechanical, °C 690
2800
Specific Heat Capacity, J/kg-K 800
120
Stiffness to Weight: Axial, points 19
3.3
Stiffness to Weight: Bending, points 59
13
Thermal Conductivity, W/m-K 1.5
1.1
Thermal Diffusivity, mm2/s 0.76
0.95
Thermal Expansion, µm/m-K 1.7
6.0