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Carbon black replacement

Carbon black replacement Imerys minerals - cost-effective, environment friendly alternatives to carbon black

Imerys minerals make cost-effective and low environmental impact (LEI) alternatives to carbon black where they improve the processability and mechanical properties of rubber compounds.


Microlamellar Imerys talcs demonstrate a synergism with carbon black.

Used in addition to, or as a partial substitution for, carbon black in EPDM compounds, Imerys talc:

  • Improves processability -lowering viscosity and improving mold flow and extrusion rates
  • Enhances mechanical properties such as elongation at break, modulus and cut/tear resistance
  • Reduces plasticizer evaporation, resulting in superior thermal and weather resistance
  • Reduces permeability by creating a barrier to the diffusion of gases
  • Improves the dispersion of carbon black-lowering mixing time by up to 20% in tire tread compounds for example, increasing production output
  • Prevents scorch

We particularly recommend our Mistron® range for synergism with carbon black.

Mistron® talc can also be surface-treated with organofunctional silane coupling agents to improve filler/elastomer interaction. This interaction results in increased modulus and a significant reduction in compression set.


Wollastonites are ideal for replacing carbon black in fluoroelastomer O-ring and gasket applications where they improve compression set and curing time.

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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