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Superfine Calcined Kaolin is a highly engineered aluminum silicate material, processed to achieve an ultra-fine particle size with excellent distribution. This product offers a combination of high brightness, low abrasion, good opacity, moderate oil absorption, high viscosity, and excellent flowability. It undergoes controlled heat treatment to remove crystalline-bound hydroxyl groups, enhancing brightness and providing superior performance for various applications.
Primarily designed for use in the production of thermal paper, high-end coated paper, and other specialized papers, Superfine Calcined Kaolin improves paper brightness, opacity, and smoothness, while reducing production costs by replacing a significant portion of titanium dioxide (TiO₂). It enhances ink absorption, printing adaptability, and dispersibility, making it ideal for high-solid content coatings used in high-speed coating processes.
| Test Items | Unit | Specification |
| Physical Form | – | Highly Pulverized Powder |
| ISO Brightness (%) | – | 91±1 |
| Screen Residue (325 Mesh) | % | ≤0.005 |
| Free Moisture @105°C | % | 0.5 max. |
| pH (28% solids) | – | 6.0-7.0 |
| Specific Gravity | g/cm³ | 2.53 |
| Particle Size (% ≤2μm) | % | 88±2 |
| Oil Absorption (g/100g) | g/100g | 75-80 |
| Bulk Density | kg/m³ | 350 |
| Hegman | – | 4.5 Min. |
| Abrasion Value (mg/100k rotation) | mg | 20 Max. |
Chemical Composition
| Component | Percentage (%) |
| SiO₂ | 52.0 ± 2 |
| Al₂O₃ | 45.0 ± 2 |
| Fe₂O₃ | ≤ 0.50 |
| TiO₂ | ≤ 0.80 |
| CaO | ≤ 0.50 |
| Na₂O | ≤ 0.20 |
| K₂O | ≤ 0.10 |
| MgO | ≤ 0.20 |
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