Silicon NitrideMacor® from Corning Inc. is a white machinable glass ceramic which withstands high temperatures while providing tight tolerance capability. It has the benefit of being machinable with ordinary metalworking tools. This makes it perfectly suitable as a prototyping material, as it can machined quickly into shape.

Macor combines the performance of a technical ceramic with the versatility of a high performance plastic. If baked out it will not outgas, so can be used for vacuum applications. By using diamond grinding and polishing techniques it can be highly polished and finished to high tolerances.

We can machine Macor into tubes, cylinders or small complex components. For larger components, Alumina may be considered a more cost-effective alternative.

Macor applications:

  • Prototyping material
  • Medical devices
  • Small vacuum components
  • Small insulating parts in electronic devices
  • Spacers in laser cavities

Property Value

Density 2.52 g/cm3
Hardness 250 Knoop
Modulus of Elasticity 9.7 x 106 psi
Flexural Strength 15 kpsi
Compressive Strength 50 kpsi
Fracture Toughness 1.53 MPa m1/2

Dielectric Strength 785 V/mil
Dielectric Constant 6.03 (@ 1 MHz)
Volume Resistivity >1014 Ohm-cm

Coefficient of Thermal Expansion 9.4 x 10-6/°C
Thermal Conductivity 1.46 W/mK
Specific Heat 0.19 cal/g °C
Maximum Working Temperature 1000 °C