Calcined Kaolin (Metakaolin) Ceramic Filler
CAS Number: 1332-58-7
Calcined kaolin (metakaolin, Al2Si2O7) is produced by thermal treatment of kaolin clay above 550 °C to remove structural hydroxyl groups. The resulting dehydroxylated product has high reactivity, enhanced brightness, and improved electrical properties compared to raw kaolin. Widely used as a functional filler in porcelain, technical ceramics, and glass-ceramics.
Technical Specifications
| appearance | White to off-white fine powder |
| purity (%) | ≥95 |
| SiO2 content (%) | 52–56 |
| brightness (ISO) | ≥88 |
| Al2O3 content (%) | 36–38 |
Applications
- Functional filler in porcelain and whiteware ceramic bodies
- Reactive component in geopolymer and alkali-activated materials
- Filler in glass-ceramic and crystalline glaze compositions
- Extender in refractory mortars and castables
- Additive in paper, rubber, and polymer composites
Key Features
- High brightness and low iron for color-sensitive ceramic applications
- Pozzolanic reactivity useful in geopolymer and blended cement systems
- Controlled particle size grades for different application viscosities
- Stable calcined phase reduces loss on ignition in ceramics
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CAS Number
1332-58-7
Category
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