Welcome to Imerys Performance Minerals


Polarite® For electrical insulation properties and improved processing

  • Excellent dielectric performance
  • High stability
  • Improved dispersibility
  • Enhanced physical properties

The Polarite® range is a line of silane-treated calcined clays. Polarite® grades are particularly suited for boosting the properties of medium to high voltage cables and extruded products.

polarite sem
Polarite® is silane-treated calcined kaolin

Wire & Cable

Used in the production of medium to high voltage cables made from EPR and EPDM, Polarite® provides excellent insulation and dielectric properties, a smooth surface finish and excellent dimensional control due to low die swell. 

Insulating properties are maintained both at high working temperatures and under wet conditions for the working life of the cable, making Polarite® a suitable additive for high temperature and submerged cable sheathing. 

It provides superior insulating properties in other cable sheathing polymers such as crosslinked polyethylene and ethylene vinyl acetate (EVA) copolymers.



Our aminosilane treated Polarite® kaolins are particularly suited for use in polychloroprene, hypalon and halobutyls where they significantly improve tensile strength, modulus, tear strength, and compression set.

Polarite is recommended for:

  • Wire and cable
  • Extrusion profiles

We offer a full range of custom 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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