Forsterite vs. Fused Silica

Forsterite belongs to the oxide-based engineering ceramics classification, while fused silica belongs to the glass and glass-ceramics. There are 9 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is forsterite and the bottom bar is fused silica.

Forsterite (Mg₂SiO₄)Fused Silica (Fused Quartz)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		2.1 to 3.1
Density, g/cm³		2.2

Dielectric Constant (Relative Permittivity) At 1 MHz		6.2
Dielectric Constant (Relative Permittivity) At 1 MHz		3.8

Dielectric Strength (Breakdown Potential), kV/mm		7.9
Dielectric Strength (Breakdown Potential), kV/mm		30

Electrical Dissipation At 1 MHz		0.00030
Electrical Dissipation At 1 MHz		0.00011

Flexural Strength, MPa		40 to 160
Flexural Strength, MPa		67

Specific Heat Capacity, J/kg-K		850
Specific Heat Capacity, J/kg-K		720

Thermal Conductivity, W/m-K		1.7 to 3.5
Thermal Conductivity, W/m-K		1.4

Thermal Diffusivity, mm²/s		0.94 to 1.3
Thermal Diffusivity, mm²/s		0.85

Thermal Expansion, µm/m-K		9.0 to 10
Thermal Expansion, µm/m-K		0.5

Forsterite vs. Fused Silica

Material Properties

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