+1 303 271 7100





Magnesia overview

Magnesia (magnesium oxide, MgO) is a specialty ceramic with outstanding high-temperature performance, used primarily in thermal engineering, heating elements, crucibles, and refractory.

Example Applications

  • High-temperature crucibles


CoorsTek Formulations

Contact a CoorsTek expert to discuss a custom manufactured Magnesia solution for your application.

Property Units Value

Flexural Strength, MOR (20 °C)


82 - 103

Fracture Toughness, KIc

MPa m1/2


Thermal Conductivity (20 °C)

W/m K


Coefficient of Thermal Expansion

1 x 10-6/°C

12 - 14

Maximum Use Temperature



Dielectric Strength (6.35mm)



Dielectric Loss (tan δ)

1MHz, 25 °C


Volume Resistivity (25°C)


1 x 1010 to 6 x 1010

The information provided on this chart is for general material property reference only.  The customer should recognize that exact properties of materials may vary according to product configuration but close control of values of most properties can be maintained, if specified. Nothing herein is provided, or is to be construed, as absolute engineering data or constituting a warranty or representation. Contact CoorsTek for cost-effective design, development and manufacturing assistance. CoorsTek has 300+ variations including various forming and firing processes, not all variants are represented in the present website.

Compare 0 materials

You can compare up to 5 materials