Overview
Kaolin is also used as an extender and flattening agent in paints. It is mainly used in architectural water-based paints and industrial coatings. The fine particle size distribution, surface charge and platy structure of kaolin enhances the functional properties of paint film like opacity and gloss, It also improves the anti-settling and rheology properties of paint. The regular grade kaolin are used as functional filler in high and medium PVC water based paint.
SPECIFICATIONS FOR PAINT GRADE KAOLIN
GRADE: PM – 82
Physical Properties
| Parameter | Specifications |
| Apperance | White |
| Moisture | 1.00% max |
| Residue 300 BSS Mesh by wet sieving | 0.50% max |
| Water of Plasticity | 32 – 35 ml/100gm |
| pH @10% solid concentration | 6 – 8 |
| Brightness (ISO) | 83 % (+/- 1%) |
| Bulk Density | 265 – 275 gm/ltr |
| Yellow Index | 3.5 – 4.5 |
| Oil Absorption | 32 – 37 gm/ltr |
| Specific Gravity | 2.6 |
Chemical Properties
| Parameter | Specifications |
| SiO2 | 44.00 – 45.00% |
| Al2O3 | 36.50 – 37.50% |
| Fe2O3 | 00.15 – 00.35% |
| TiO2 | 00.15 – 00.25% |
| CaO + MgO | 00.05 – 00.25% |
| Na2O + K2O | 00.15 – 00.25% |
| L.O.I | 13 – 14% |
GRADE: PM – WHITE
Physical Parameters
| Parameter | Specifications |
| Apperance | White Lumps |
| Moisture | 5.00% max |
| Residue 300 BSS Mesh by wet sieving | 1.00% max |
| Water of Plasticity | 28 – 30 ml/100gm |
| pH @10% solid concentration | 7.5 – 8.5 |
| Brightness (ISO) | 80 % (+/- 1%) |
| Total Shrinkage (11050C ½ hour soak) | 11.50% max |
| Fired Brightness – L* Value (11500C) | 90 – 92% |
Chemical Properties
| Parameter | Specifications |
| SiO2 | 46.00 – 47.00% |
| Al2O3 | 36.50 – 37.50% |
| Fe2O3 | 00.30 – 00.38% |
| TiO2 | 00.90 – 01.10% |
| CaO + MgO | 00.25 – 00.35% |
| Na2O + K2O | 00.10 – 00.15% |
| L.O.I | 13.25 – 13.75% |