Bentonite
Rheology-modifying bentonite for suspension, viscosity control and thixotropic performance.
Learn MoreKaolin, or china clay, is a fine, bright hydrous aluminium silicate used in ceramics and as a filler in adhesives, rubber, paint and laundry soap bars. We supply locally milled kaolin as well as several imported water-washed kaolins which have lower free silica content.
The table compares seven kaolin grades, from washed and milled to calcined and non-irradiated types, with specifications and recommended applications. Use particle size (D50) and reflectance (R457) to match fineness and brightness, and check the chemical content (SiO₂, Al₂O₃, Fe₂O₃, TiO₂) for compatibility with your process.
| Grade | Type | D50, microns | Reflectance (R457) | Fired reflectance | SiO₂ (%) | Al₂O₃ (%) | Fe₂O₃ (%) | TiO₂ (%) | Applications | Stocked In |
|---|---|---|---|---|---|---|---|---|---|---|
| HW POWDER | Washed | 1.5 | 79 | 93 | 47.5 | 37.5 | 0.5 | 0.6 | Rubber & Plastics Ceramics | CPT |
| ALUSIL SX | Washed | 1 | 84 | 94 | 45 | 37 | 0.35 | 0.9 | Rubber & Plastics Ceramics | CPT |
| ECOPOZZ MTK 60 | Metakaolin | 9 | 70 | n.a. | 56.8 | 43.5 | 0.5 | 1.3 | Construction | CPT |
| KAOLIN SUPER | Milled | 5.8 | 74 | n.d. | 69 | 20 | 0.54 | 0.84 | Rubber & Plastics | JHB |
| KAOLIN WHITE | Milled | 6 | 80 | n.d. | 45 | 34 | 0.5 | 0.5 | DBN | |
| B.P. GRADE KAOLIN | non- irradiated | 1 | 84 | 94 | 45 | 37 | 0.35 | 0.9 | CPT | |
| HT-90 | calcined | 1 | 93 | n.d. | 53.5 | 42.9 | 0.9 | 0.96 | Paint & Coatings Rubber & Plastics | DBN & CPT |
No grades match this application.
Kaolin's naturally flat, plate-like particles improve smoothness, barrier properties and ink holdout, particularly valuable in inks and coating applications.
Imported water-washed kaolins (Alusil SX and HW , B.P. Grade Kaolin) reduce abrasiveness compared to milled grades, an advantage in rubber and fine industrial filler use.
Calcined grades (HT-90) retain high reflectance even after firing (93), while the metakaolin grade (Ecopozz MTK 60) offers pozzolanic reactivity for construction/concrete applications.
Makes kaolin an excellent carrier in agriculture. Its clay properties mean it can be formed into pellets, plus it is a safe, inert and natural mineral that has been extracted from the earth.
Rheology-modifying bentonite for suspension, viscosity control and thixotropic performance.
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