Calcined Kaolin: Engineered for Maximum Opacity & Whiteness
Calcined Kaolin is produced by heating high-quality kaolin clay at high temperatures (around 650-900°C). This heating process, called calcination, removes the natural moisture from the mineral and changes its structure. As a result, calcined kaolin becomes brighter, harder, and more stable, with improved insulating properties. Because of these enhanced qualities, it is widely used as a high-performance additive in many industrial applications, rather than just a basic filler.
Key Features
- High temperature resistance
- Improved hardness and durability
- Excellent opacity and covering power
- No Plasticity
- Low moisture content
- Enhanced chemical stability
Product Specifications
- Aluminum Oxide (Al₂O₃) Content: 42% - 46% (concentrated due to water removal)
- Silicon Dioxide (SiO₂) Content: 50% - 54%
- Brightness (ISO): 90 - 96 (higher than hydrous kaolin)
- Moisture Content: < 0.5% (virtually dry)
- Oil Absorption ( g/100g ): 50 - 70 (a key performance metric)
- Specific Gravity: ~2.6 g/cm³
Available Sizes Grades
- Fine Powders: Typically sold as finely milled powders.
- Micronized Grades: Classified by median particle size (e.g., 1.4 microns).
- Surface-Treated Grades: Chemically modified to improve compatibility with polymers.
- Custom grades available on request