How is China Clay different from other clays?
Kaolin possesses simple structure and useful physical properties, which is suitable to be applied in different aspects. It may be of different quality depending on the origin, composition, purity, particle size and processing.
From Raw Clay to Fine Powder
China clay undergoes various stages of processing before it can be used as an industrially useful material. Clay is dredged and cleaned and sand and mica are separated. The purified clay is then washed and filtered, dried, and milled to a very fine powder.
This processing is employed to produce kaolin which can be used for certain industrial applications.
Where Is Kaolin Used?
Kaolin is a key raw material in the ceramics, paper, paints and coatings, plastics, rubber, adhesives and cosmetic industry.
Key Benefits of Kaolin Across Industries
- Paper Industry
- Improved Gloss and Smoothness: Enhances the surface finish and appearance of paper.
- High Brightness and Opacity: Improves whiteness, brilliance, and print quality.
- Fiberglass Industry
- Excellent Dispersion: Supports uniform glass fiber formation.
- Controlled Particle Size: Promotes consistent processing and product quality.
- Ceramics and Sanitaryware
- High Brightness: Delivers superior whiteness in tiles and sanitaryware.
- Controlled Particle Size: Ensures a smooth finish and uniform texture.
- Low Iron Content (Fe₂O₃): Supports purity and color consistency.
- Excellent Dispersion: Enables stable slurry preparation and efficient processing.
- Improved Plasticity and Green Strength: Supports shaping and handling before firing.
- Enhanced Rheological Properties: Helps maintain consistent processing performance.
- Printing and Packaging Inks
- High Brightness and Opacity: Improves ink coverage and reduces pigment consumption.
- Controlled Particle Size: Ensures smooth dispersion and stable viscosity.
- Excellent Suspension Properties: Helps prevent settling and enhances shelf life.
- Improved Durability and Rub Resistance: Supports long-lasting print quality.
In ceramics, it is used to improve characteristics such as plasticity, green strength, and rheological properties.
Kaolin can also be used in cosmetics due to its absorbent properties, especially in facial masks.
Why is quality important?
Kaolin is not just ordinary white clay. Performance is related to purity, brightness, particle size and consistency. These properties affect the material’s performance in various applications.
The knowledge of the material and its processing is therefore important in the choice of China clay for its use in industry.
