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Fused Silica vs. C-820 Magnesia Ceramic

Fused silica belongs to the glass and glass-ceramics classification, while C-820 magnesia ceramic belongs to the oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is fused silica and the bottom bar is C-820 magnesia ceramic.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
100
Flexural Strength, MPa 67
53

Thermal Properties

Specific Heat Capacity, J/kg-K 720
950
Thermal Conductivity, W/m-K 1.4
8.0
Thermal Expansion, µm/m-K 0.5
11

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.8
9.6
Electrical Dissipation At 1 MHz 0.00011
0.00030

Otherwise Unclassified Properties

Density, g/cm3 2.2
2.7

Common Calculations

Stiffness to Weight: Axial, points 18
21
Stiffness to Weight: Bending, points 63
58
Thermal Diffusivity, mm2/s 0.85
3.1