Fireclay brick chemical composition

Fireclay brick is a type of refractory brick made from high-quality clay materials, typically containing a high proportion of kaolinite. The exact chemical composition of fireclay brick may vary slightly depending on the source and production method, but typical ranges for its main chemical components are:

Silica (SiO2): 50-70%

Alumina (Al2O3): 20-35%

Iron oxide (Fe2O3): 1-5%

Lime (CaO): 0-2%

Magnesia (MgO): 0-2%

Potassium oxide (K2O): 0-1%

Sodium oxide (Na2O): 0-1%

The above chemical components make up the major part of the fireclay brick's composition. In addition, minor impurities such as titanium oxide, manganese oxide, and phosphorus pentoxide may also be present in small amounts.

Fireclay bricks have excellent thermal stability, high refractoriness, good resistance to corrosion and abrasion, and excellent strength at high temperatures. They are widely used in many industrial applications, such as furnaces, kilns, incinerators, and other high-temperature equipment, due to their good performance under harsh conditions.