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Kaolin is a layered silicate clay mineral, part of the group of minerals with the chemical composition Al2Si2O5(OH)4
Kaolin can be characterised by:
- Relatively low Mohs hardness of 2
- Low electrical conductivity
- Easy to wet
- High inertness in various media
- Its layered structure
|Hardness (Mohs)||1.0 – 2.0||[-]|
|Density||2.16 -2.68||[kg/ dm3]|
Sibelco’s kaolin based productsare of two different types: air-floated kaolin and hydrous kaolin.
Hydrous kaolin is characterised by its fine particle size, plate-like or lamellar particle shape and chemical inertness.
Kaolin products are often used in formulations (sealants, adhesives, carpet-backing) to give these more body, while in adhesives kaolin products can also affect the rheology. Because of their low electrical conductivity kaolin products are also used in the wire and cable industry.
In plastics, mostly PA, kaolin products are being used to improve flexural and impact strength. It also reduces warpage and shrinkage of the molded articles.