Synthetic Sapphire vs. High-alumina Refractory

Both synthetic sapphire and high-alumina refractory are oxide-based engineering ceramics. There are 7 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is synthetic sapphire and the bottom bar is high-alumina refractory.

Synthetic Sapphire High-Alumina Refractory (IEC 60672 Type C-510)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		4.0
Density, g/cm³		2.1

Flexural Strength, MPa		1090
Flexural Strength, MPa		28

Maximum Temperature: Mechanical, °C		2000
Maximum Temperature: Mechanical, °C		1200

Specific Heat Capacity, J/kg-K		760
Specific Heat Capacity, J/kg-K		800

Thermal Conductivity, W/m-K		30
Thermal Conductivity, W/m-K		1.5

Thermal Diffusivity, mm²/s		9.9
Thermal Diffusivity, mm²/s		0.87

Thermal Expansion, µm/m-K		5.3
Thermal Expansion, µm/m-K		4.3

Synthetic Sapphire vs. High-alumina Refractory

Material Properties

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