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Paper coating grade calcined kaolin
1. Main properties and features
| Chemical substances | kaoin / calcined |
| Appearance | white powder |
| Packing | 25kg woven bag/ kraft paper bag, 1000kg sack |
| Main features | low particle size, high whiteness, goood fluidity, goood surface smoothness, high luster, good absorption of printing ink, good hiding power |
| Range of application | Used in paper making coating. |
2. Quality Index
| NO. | Item | Unit | Physical Index | |
| LJ-1 | LJ-2 | |||
| 1 | Whiteness | % | ≥90 | ≥90±2 |
| 2 | 325-mesh Residue on sieve% | % | £¼0.004 | ≤0.005 |
| 3 | Refractive index | % | 1.62 | 1.62 |
| 4 | Water content | % | £¼0.5 | £¼0.5 |
| 5 | pH-value of aqueous suspension | 6.5-7.2 | 6.5¡«7.2 | |
| 6 | Oil absorption(depend on different fineness) | %g/100g | 60±5 | 60±5 |
| 7 | £¼2um content | % | ≥90±2 | ≥78 |
3. Chemical Index
| SiO2(%) | Al2O3(%) | Fe2O3(%) | TiO2(%) | CaO(%) | MgO(%) | K2O(%) | Na2O(%) | L.O.L(%) |
| 50±2 | 45±2 | £¼0.5 | £¼1.1 | £¼0.3 | £¼0.2 | £¼0.06 | £¼0.2 | 0.5 |
