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).
Architectural & Industrial Coatings: Matt and satin emulsions, primers Only available with Store Name subs & specialty coatings where a high degree of opacity and smooth application are required.
Paper & Paperboard: White pigment functional for coating and filling, improved brighness, ink acceptance and printed matter properties.
Ceramics & Refractories: Atmosphere: Reduction, Oxidation Usage: As a body and glaze ingredient to improve whiteness, thermal expansion-control etc.
Adhesives & Sealants: May also be a utilizable extender enhancing rheology, sag resistance and economics.
Plastics & Rubber (Specialty Grades): Enhances stiffness, heat resistance and dimensional stability in certain formulations.
Cosmetics (Controlled Grades): It is added to masks and cleansing products as a texture modifier and visual brightening agent (cosmetic grade only).
We produce our calcined kaolin products under strict quality controls, and they are manufactured using the latest technologies to provide top-quality opacification with lowest carbon footprint.
Available in a variety of grades, customizations and technical guidance to facilitate the cost-effective achievement of performance purposes, delivered as part of our supply chain you can trust.
Q: What is calcined kaolin?
A: Calcined kaolin (metakaolin) is thermally treated kaolin clay with chemically bound water removed, resulting in higher brightness, hardness, and opacity.
Q: How does it differ from hydrous kaolin?
A: Hydrous kaolin retains structural water and is softer, whereas calcined kaolin is anhydrous, more rigid, and provides superior opacity enhancement.
Q: What is its role in paints?
A: It functions as a TiO₂ extender, improving dry hiding, film build, and cost efficiency—especially in matt and satin coatings.
Q: Is calcined kaolin suitable for ceramics?
A: Yes. It is widely used in glazes and whiteware bodies to improve whiteness, thermal stability, and mechanical strength.
Q: Are different grades available?
A: Yes. Multiple grades are available based on particle size, brightness, and end-use performance requirements.
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