China Clay is a clay mineral with the chemical composition Al2Si2O5(OH)4. Rocks that are rich in kaolinite are known as china clay or white clay. China Clay has a low shrink-swell capacity and a low cation exchange capacity (1-15 meq/100g). It is a soft, earthy, usually white mineral (dioctahedral phyllosilicate clay), produced by the chemical weathering of aluminium silicate minerals.

Industrial Applications of

China Clay

  • Paper Industry – The primary use of China Clay is in the paper industry.  It serves as a paper coating which improves appearance by contributing to brightness, smoothness and gloss.  It also improves printability.  Additionally, it is used by the paper industry as a filler reducing cost and the use of tree-based resources.
  • China, Porcelain and Tableware – China Clay serves as a valuable component in china and other tablewares.  Its color, gloss and hardness are ideal characteristics for such products.
  • China Clay is used in ceramics, medicine, coated paper, as a food additive, in toothpaste, as a light diffusing material in white incandescent light bulbs, and in cosmetics.
  • It is also used in paint to extend titanium dioxide (TiO2) and modify gloss levels.
  • In rubber for semi-reinforcing properties.
  • In adhesives to modify rheology, etc.