Calcined Kaolin

Calcined kaolin improves glaze opacity and whiteness, provides consistent chemistry without the variability of raw clay, reduces glaze crawling and cracking during drying, and delivers better surface finish and smoothness in the fired glaze layer.

The calcination process changes the refractive properties of the kaolin particles, making them more effective at scattering light within the glaze matrix and thereby improving opacity and whiteness compared to raw kaolin.

Yes. Calcined kaolin has already undergone thermal transformation, so it exhibits minimal firing shrinkage when incorporated in ceramic bodies and glazes. This contributes to better dimensional stability and reduced defects in the fired product.

Calcined kaolin is most beneficial in tile glaze, tile engobe, and GVT (glazed vitrified tile) formulations where consistent whiteness, opacity, and surface finish are critical. HYPER 80 is specifically used by high-end tile manufacturers for these demanding glaze applications.

Our calcined kaolin grades — HYPER 80 and HYPER FILL H — are ultrafine grades with controlled particle size distribution, ensuring good dispersion in glaze slips, consistent opacity, and uniform surface coverage in ceramic glaze and engobe applications.