Welcome to Imerys Performance Minerals

Mechanical properties

Mechanical properties Imerys minerals are excellent reinforcement agents improving the mechanical properties of rubber compounds

Imerys minerals improve the mechanical properties of finished rubber items in most rubber applications. They can be used in association with most elastomers commonly used by the rubber industry.

Imerys kaolins, calcined clays, talcs, wollastonites and diatomaceous earths, particularly the finest grades with the highest surface area, are highly effective mechanical reinforcement agents in rubber.

Imerys minerals improve:

  • Tensile strength
  • Elongation
  • Modulus
  • Compression set
  • Cut and tear resistance
  • Abrasion resistance
  • Crack growth and fatigue resistance
  • Thermal and weather ageing


Imerys calcined clays such as those from our Polestar and Glomax ranges are particularly effective for improving all-important compression set in gaskets and seals.
Our Suprex and Hexafil hydrous clays are excellent solutions for boosting the mechanical performance of rubber hoses for automotive and domestic appliance applications.


Microlamellar Mistron®, which has a higher surface area at the same fineness as conventional lamellar talc, improves elastomer chain wetting, providing better reinforcement levels than conventional lamellar talcs. Used as a partial substitution for carbon black, Mistron® improves mechanical properties such as elongation at break and cut and tear resistance of peroxide cured compounds, even at high temperatures.


Fine grade wollastonites such as our Wollastocoat® range with their acicular shape provide excellent reinforcement properties and reduced costs in fluoroelastomer (FKM) seals, gaskets, plugs, o-rings and molded applications.

Diatomaceous earth

Natural diatomaceous earths such as our Celtix grades are a good choice for replacing precipitated silica to improve compression set in EPDM.



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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