Calcium Carbonate
High-purity ASCOM ground calcium carbonates for paint, paper, plastics and masterbatch, ranging from coarse calcite chips to ultrafine coated grades.
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.
Grades stocked
7
Grade Forms
4
Application Sectors
5
Speciality Options
B.P. Grade & Calcined
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.
Get in touch with one of our experts who will guide you on our different product grades and which will be best suited to your application.
High-purity ASCOM ground calcium carbonates for paint, paper, plastics and masterbatch, ranging from coarse calcite chips to ultrafine coated grades.
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Bentonite and zeolite are aluminium silicate minerals that can occur together naturally, but each has distinct properties.
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A carbonate mineral of calcium and magnesium. It is used as an inexpensive filler, amongst other things.
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Used for hardness, scrub resistance and to give texture to textured paints.
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High-reactivity pozzolan, improves strength, durability, and sulfate resistance in blended cement
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