Calcined kaolin is being dried, calcined at temperatures generally between about 1000–1050 °C to remove chemically bonded water and form a partially amorphous, anhydrous alumino-silicate known as metakaolin. This thermally activated control extensively changes the optical, mechanical and surface properties of the mineral: higher brightness, hardness and functionality are achieved compared hydrous kaolin.
In paints and coatings & other related applications, calcined kaolin yields high performance as a component which will improve the value of resin for ease of paint application and resistance to dirt, weathering colour fade, gloss retention etc., apart from enhancing wo not consume loaded property due to its coarse surface texture in dry film & thus also impart better dry hiding / opacity with easier dispersion for cost economy ( Even partial replacement of TiO2).
