Welcome to Imerys Performance Minerals


Foaming Imerys minerals for uniform cell size and distribution in polymeric foam

Imerys micro-lamellar talcs make superior nucleating agents for polyolefin-based foam composites used to produce lightweight materials with improved stiffness at lower densities. Imerys ground and precipitated calcium carbonates are suitable cost-effective foaming agents for PVC and expanded polystyrene.


The high surface area of micro-lamellar talc promotes the nucleation of uniform/narrow gas bubbles during the foaming process increasing the number of foam cells and making cell distribution and growth more consistent.

Imerys talcs provide:

  • A significant increase in cell density
  • Fine and regular cell size
  • Improved stiffness at lower densities
  • Optimized lightweight materials

PP cell density increases with talc loading

Mistrocell in PP foam
Mistrocell's platelets allow more gas to be trapped, increasing cell number and making cell distribution more uniform

We recommend our Mistrocell® range of  micro-lamellar talc products or our surface treated Mistron® ZSC micro-lamellar talc for nucleating polyolefins, PS, PVC and polyurethane foams.

Calcium Carbonates

Imerys ground calcium carbonates (GCC), such as our PolCarb® and ImerCarb® grades are very cost-effective foaming agents for PVC.

Precipitated calcium carbonates (PCC) such as our Socal® and Winnofil® grades are excellent foam nucleation additives in expanded polystyrene (EPS).


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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