Cordierite - general information

What is it cordierite?

Nature cordierite is a magnesium iron aluminium cyclosilicate.

Cordierite has excellent thermal properties. On the air, however, leads to its transformation into a muscovite, biotite and chlorite.

An alternative to the natural cordierite is cordierite ceramics - synthetic cordierite.

Material containing over 10% of MgO and over 34% of Al2O3 is typical for its low thermal expansion coefficient, hardness and stability.

Stable α-cordierite with a melting point at 1435 °C is produced by decay of magnesium and kaolinitic materials during firing near 1400 °C.

Cordierite is commonly used for production of special refractory ceramics (burning utilities, etc.) and electro technical applications (electrical insulators, contactors, heaters carriers, etc.) due to its low thermal expansion coefficient and high resistance to sudden temperature changes.

A suitable composition of cordierite with other types of refractory grog can get good thermally stable materials appropriate for higher temperature than the own melting point of cordierite pottery.

“ČLUZ” cordierite:

  • material with high hardness and a low thermal expansions coefficient
  • during the heating there are no phase changes that would be associated with length or volume changes ® material is especially suitable for products exposed to frequent and sudden temperature changes


  • for the production of refractories or cast fire
  • in the construction of furnaces / kiln cars
  • in the manufacture of cutting tools for burning fittings
  • by the construction of chimneys, stoves
  • in the ceramic industry
  • in the electrotechnical industry