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📌 What is China Clay? China Clay, also known as Kaolin, is a naturally occurring fine white clay mineral primarily composed of kaolinite. It is formed by the chemical weathering of feldspar-rich rocks such as granite over long geological periods. China clay is valued for its high whiteness, softness, chemical inertness, and low abrasiveness, making it suitable for a wide range of industrial and commercial applications.
| China Clay Type | Key Properties | Common Applications | Testing Standards |
|---|---|---|---|
| Hydrous Kaolin | Natural, retains water, fine particles | Ceramics, paper, paints | ISO 1767, ASTM D4218 |
| Calcined Kaolin | Heat-treated, higher whiteness | Ceramics, plastics, rubber | ISO 1767, ASTM D4218 |
| Delaminated Kaolin | Mechanically processed, plate-like | Paper coating, paints | ISO 1767, TAPPI T441 |
| Surface Modified Kaolin | Chemically treated, better dispersion | Plastics, adhesives, rubber | ISO 1767, ASTM D4218 |
| Meta Kaolin | Calcined at high temperature, pozzolanic | Cement, concrete | ASTM C618, EN 450 |
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