Welcome to Imerys Performance Minerals

UK Clays

UK Clays

Imerys UK Clays are premium hyper-platy clays mined and processed in Cornwall in southwest England. Imerys UK clays present a large plate diameter and thin crystal dimension that can deliver unique value to a variety of paper and board grades.

Functional fillers

Imerys UK kaolin filler options are suitable for a wide range of papers, including newsprint, super calendered, uncoated mechanical papers and SC magazine papers.

Our general purpose Intrafill grades confer a combination of brightness and particle size providing good optical and print properties and good retention characteristics. Benefits include reduced sheet porosity and improved printability whilst maintaining satisfactory optical performance. 

Intramax filler kaolins are designed to achieve maximum optical performance in SC magazine papers produced under acid pH conditions.


In LWC gravure papers, ultra-platy kaolins such as our Suprasmooth grades provide improved coating coverage delivering better smoothness and gloss and allowing papermakers to cover rougher base stock with less calendering.  In the pre-coat, papermakers can utilize large kaolin plates combined with blocky pigments to create a structured coating that improves optical and physical coverage.

Suprasmooth helps optimize costs. By producing a rougher, bulkier base paper, paper and board producers can increase machine speeds and improve fiber yield

Using Suprasmooth kaolins in coating formulas also reduces the need for expensive opacifiers and binders.

Imerys UK kaolin ranges

  • Suprasmooth - Coating grades
  • Intramax - Filler grades
  • Intrafill - Filler grades



We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.

Please contact us. We will be only too happy to help

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Paper & Board