Refractory ceramics

Refractory products are designed to withstand high temperatures, but also abrasion and corrosion caused by chemicals or gases. Most have a broad "pasty" melting range, which is why a precise melting point cannot be attributed to them. Therefore a pyrometric cone equivalent or PCE is defined and a product is considered refractory when its PCE (or melting temperature) is equal to or greater than 1500°C.

Refractory products are not, except in certain rare cases, metallic components. They are essentially silicates and oxides, carbon and certain carbides.

Refractory products can be divided and classified according to their chemical nature or their physical presentation. A product’s chemical nature is a fundamental factor in its selection for a given use as this influences its resistance to heat, corrosion and thermal shocks. This classification was initially established for traditional dense shaped products. Classification according to physical presentation:

  • dense shaped products electrofused and sintered products
  • shaped rigid insulating refractory products
  • high temperature insulation wool (HTIW)
  • unshaped prepared products