Insulation/semiconductor conductivity

ALUMINA	HIGH LOW	＞10¹⁴	General use Wear resistance Electrical insulator Dielectric strength Low dielectric loss
ALUMINIUM NITRIDE		＞10¹⁴	Thermally stable Electrical resistivity
SILICON NITRIDE		＞10¹⁴	High toughness Thermal shock resistant Tight tolerances
CORDIERITE		＞10¹⁴	Good thermal expansion Excellent thermal shock resistance
STEATITE		＞10¹⁴	Good dielectric strength Low dielectric loss
ZIRCONIA		＞10¹³	Toughness Mechanical Strength High Heat Resistance Corrosion Resistance
SILICON CARBIDE		＞10⁸	Hardness Mechanical strength Variable electrical resistivity Distinct properties that can be tailored