Aluminum Oxide (Al2O3)

• Good strength and stiffness
• Good hardness and wear resistance
• Good corrosion resistance
• Good thermal stability
• Excellent dielectric properties (from DC to GHz frequencies)
• Low dielectric constant
• Low loss tangent

Macor (glass ceramic)

• Zero porosity and non-shrinking
• High dielectric strength
• Electrical resistivity
• Withstands high temperatures up to 1000ºC
• Tight tolerance capability
• Easily and economically machined into complex shapes and precision parts

Sapphire

• Chemically inert.
• Can be hermetic brazed
• High light transmission

Silicon Nitride (Si3N4)

• High strength over a wide temperature range
• High fracture toughness
• High hardness
• Outstanding wear resistance, both impingement and frictional modes
• Good thermal shock resistance
• Good chemical resistance

Zirconia Toughen Alumina (ZTA)

• Excellent strength
• Excellent toughness
• Excellent wear resistance
• High temperature stability
• Corrosion resistance

Aluminum Nitride (AlN)

• Very good thermal conductivity
• Thermal expansion coefficient similar to that of Silicon
• Good dielectric properties
• Good corrosion resistance
• Stability in semiconductor processing atmospheres

Quartz

• Near zero thermal expansion
• Exceptionally good thermal shock resistance
• Very good chemical inertness
• Can be lapped and polished to fine finishes
• Low dielectric constant
• Low dielectric loss
• Good UV transparency

Silicon Carbide (SiC)

• Low density
• High strength
• Good high temperature strength 
• Oxidation resistance
• Excellent thermal shock resistance
• High hardness and wear resistance
• Excellent chemical resistance
• Low thermal expansion and high thermal conductivity

Zirconia (Zr02)

• High temperature capability up to 2400ºC
• High density
• High strength and fracture toughness
• High hardness and wear resistance
• Low thermal conductivity (20% that of Alumina)
• Good chemical resistance
• Ionic conductivity