Welcome to Imerys Performance Minerals


Mistrocell® For stronger, lighter foamed polymers

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

Mistrocell® talc is an ideal nucleating agent for foam composites used to produce lightweight materials with improved stiffness for the automotive and packaging industries.

Mistrocell® has a unique micro-lamellar morphology which is shown to generate larger number of cell nuclei resulting in finer cell structure and higher cell density.

Mistrocell® has a unique micro-lamellar morphology

Lamellar talc
SEM photo Mistrocell
Micro-lamellar Mistrocell®


  • Increases cell density significantly
  • Promotes fine and regular cell size
  • Improves stiffness at lower density
  • Optimizes lightweight materials

Mistrocell® in polypropylene

Using micro-lamellar Mistrocell® as a nucleating agent in polypropylene (PP) results in foams with cell densities twice as high as those obtained with lamellar talc.

Cell density is twice as high with Mistrocell® than with lamellar talc

PP + 1% lamellar talc
PP + 1% micro-lamellar Mistrocell®

The highest cell nucleation rate is obtained with 5 wt% of Mistrocell®

At this loading, using the injection-molding MuCell® foaming process, a weight reduction of 10% can be achieved with the same specific elastic storage modulus as an unfilled solid PP.

Mistrocell® in polystyrene

In polystyrene, a 5% Mistrocell® loading can be used to achieve microcellular foams:

Microcellular polystyrene foams with Mistrocell®

SEM photo PS nucleated with Mistrocell

Mistrocell® has proved effective in polyolefins and polystyrene compounds. It will be equally valuable in other types of polymers.

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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