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Kaolin (China-clay) is a hydrated aluminum silicate crystalline mineral (kaolinite) formed over many millions of years by the hydrothermal decomposition of granite rocks.

Hydrous kaolin is characterized by its fine particle size, similar to that of a plate (lamellar particle) and chemical inertness. Due to its whiteness, fine particle size and plate-shape structure, kaolin is used as coating, functional filler, extensor, ceramic raw material and pigment.

It also acts in refractory applications, catalysts, concrete and glass fibre.

Kaolin is a unique industrial mineral that stays inert over a wide range of pH and offers excellent coverage when used as pigment in coated films.