Kaolin Clay (Paper Coating & Filler Grade)
CAS Number: 1332-58-7
Kaolin clay (hydrated aluminum silicate) is the primary coating pigment used in paper and board manufacturing, providing excellent gloss, printability, and ink receptivity. Its platelet morphology creates a smooth, dense surface ideal for offset, gravure, and digital printing. Calcined and delaminated grades offer enhanced brightness and opacity for premium coated paper applications.
Technical Specifications
| appearance | White to off-white powder or slurry |
| pH (slurry) | 6.0–8.0 |
| aspect ratio | 10:1–20:1 |
| brightness (ISO, %) | 82–92 |
| median particle size (d50, μm) | 0.3–2.0 |
Applications
- Primary coating pigment in coated printing and writing paper
- Filler in uncoated paper for improved surface smoothness
- Gravure and offset printing paper surface coating
- Coated board and packaging paper coating
- Specialty coating for cast-coated and high-gloss paper
Key Features
- Platelet structure provides smooth, specular surface for high gloss
- Excellent ink receptivity for sharp print quality
- Multiple grades: coating, filling, calcined, and delaminated
- Good compatibility with SB latex and starch binders
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