Welcome to Imerys Performance Minerals


PoleStar® For electrical insulation in low-to-medium voltage cables and improved processing

  • High stability and purity
  • High insulating properties
  • 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.

Polestart SEM
PoleStar® is calcined kaolin

Wire & Cable

PoleStar® provides excellent insulation properties in low and medium voltage power cables. Due to its low moisture pick-up, it is an excellent 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 for extruded and calendered rubber where it provides a smooth finish and excellent dimensional control due to the low die swell.

PoleStar is recommended for:

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

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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