Kaolin

Introduction

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

Basic properties

Snobrite is the product name for Sibelco’s kaolin based products. There are 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.

Snobrite products often used in formulations (sealants, adhesives, carpet-backing) to give these more body, while in adhesives Snobrite products can also affect the rheology. Because of their low electrical conductivity Snobrite products are also used in the wire and cable industry.

In plastics, mostly PA, Snobrite products are being used to improve flexural and impact strength. It also reduces warpage and shrinkage of the molded articles.