Welcome to Imerys Performance Minerals



  • High stability and purity
  • Highly insulating
  • Low moisture pick-up
  • Excellent processability
  • Low compression set

Imerys PoleStar is a high purity fully calcined kaolin.  It is calcined at above 1000°C to give a particle shape and morphology that is suited to a wide range of rubber applications.

PoleStar is particularly suitable for EPDM cable insulation and light colored extruded rubber profiles.

PoleStar™ is calcined kaolin

Wire & Cable

PoleStar imparts excellent insulation properties in low and medium voltage power cables. Due to its low moisture pick-up, it is a particularly good choice for guaranteeing insulation properties under wet operating conditions.

PoleStar also improves compression set, making it suitable for the production of rubber cable sheathing of flexible cable. 

Used in partial replacement of ATH or MDH in halogen-free cables it provides superior flame retardancy, abrasion and oil resistance while maintaining good electrical properties.

EPDM extrusion

PoleStar is a valuable processing aid in for extruded and calendered rubber where it confers a very smooth finish and excellent dimensional control due to the low die swell it imparts

PoleStar is recommended for:

  • Wire and cable
  • EPDM/EPR extruded profiles
  • Pharmaceutical rubber

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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