Synthetic Sapphire vs. Forsterite

Both synthetic sapphire and forsterite are oxide-based engineering ceramics. There are 8 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is synthetic sapphire and the bottom bar is forsterite.

Synthetic Sapphire Forsterite (Mg₂SiO₄)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		4.0
Density, g/cm³		2.1 to 3.1

Dielectric Constant (Relative Permittivity) At 1 MHz		10
Dielectric Constant (Relative Permittivity) At 1 MHz		6.2

Dielectric Strength (Breakdown Potential), kV/mm		9.9
Dielectric Strength (Breakdown Potential), kV/mm		7.9

Flexural Strength, MPa		1090
Flexural Strength, MPa		40 to 160

Specific Heat Capacity, J/kg-K		760
Specific Heat Capacity, J/kg-K		850

Thermal Conductivity, W/m-K		30
Thermal Conductivity, W/m-K		1.7 to 3.5

Thermal Diffusivity, mm²/s		9.9
Thermal Diffusivity, mm²/s		0.94 to 1.3

Thermal Expansion, µm/m-K		5.3
Thermal Expansion, µm/m-K		9.0 to 10

Synthetic Sapphire vs. Forsterite

Material Properties

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