Welcome to Imerys Performance Minerals


Automotive Imerys minerals improve the chemical-physical properties and performance of rubber automotive components and tires

Automotive applications include exposure to some of the toughest environments rubber parts have to endure. Using Imerys minerals as processing aids and multifunctional fillers in rubber automotive components helps them meet stringent design specifications and stand the test of time. Imerys offers an extensive portfolio of minerals to improve the mechanical properties, permeability, compression set, aesthetics and overall performance of tires, under-the-hood and hydraulics parts, hoses, car body seals and fluoroelastomer (FKM) fuel injector O-rings.

Tire Inner Liners


Imerys minerals are the perfect solution for producing tires. 

Imerys Hyper platy kaolins such as our Hydrite® SB100 improve the air permeability and gas barrier of inner tire liners enabling down gauging and contributing to better fuel efficiency as well as extending service life. It can also be used as an alternative to carbon black without impairing mechanical performance.

Our Hydrite® SB60 product can be incorporated at significant loading, reducing formulation costs and improving permeability performance at standard inner liner gauge.

Kaolin offers the following benefits:

  • Barrier
  • Reinforcement
  • Durability (service life)

Gaskets, Hoses and Seals

Partial replacement of carbon black

Imerys minerals are excellent partial replacements for carbon black in O-rings, car door seals, gaskets and hoses.  Partial replacement of carbon black by mineral fillers:

  • Improve compound flow
  • Maintain mechanical properties
  • Improve thermal and weather aging
  • Improve impermeability
  • Reduce electrical conductivity

Recommend products:

Air Float Kaolin:
Franklin R

Mercap 100/200
Amlok 321

Calcined Kaolin:
Glomax® LL
® 400

Calcium Carbonate:
Imerseal 75
Socal 31

Celite SuperFloss

Hydrite® VS
Polarite® 307S
Polarite® 403A

Suzorite 325-G

The primary use of automotive gaskets and seals are to keep liquids (fuel, oils and brake fluids) and gases (air conditioning gas, exhaust gases) in or to keep them out.  To do this, gaskets and seals must have excellent compressive properties.

We recommend our calcined kaolin product Glomax® LL range for improving compression set in gaskets and seals.


One of the most important characteristics defining hose performance is impermeability. Once installed, hoses generally have a long life-cycle in potentially harsh environments. Aging performance is therefore crucial.

Imerys kaolins such as our Hydrite® SB100 and Hydrite® SB60 provide excellent barrier properties to rubber compounds, reducing permeability significantly. This key attribute offers new possibilities for hose end-use performance, such as fuel hoses, and enables downgauging.

Mechanical properties

Mechanical performance of automotive hoses is also crucial. Our Suprex and Hydrite® hydrous clays are excellent solutions for boosting mechanical performance in hoses.

Car Body Seals

Calcined kaolin provides outstanding extrusion properties, producing excellent surface finish and low compression set. Calcined kaolin also reduces electrical conductivity and protects against corrosion.

We recommend our  PoleStar® and Glomax® calcined clays for EPDM applications. 

Hyper platy kaolin clay is an excellent choice for eliminating yellowing and iridescence in EPDM car body seals - guaranteeing a better long-term appearance of EPDM profiles. Replacing carbon black with kaolin clay also enhances mattifying and reduces electrical conductivity.

Fluoroelastomer O-rings for Fuel Injector Seals

Fluoroelastomers (FKM) are in the most challenging sealing applications. Seals produced from FKM provide the optimal balance of thermal resistance, chemical resistance and sealing strength.  

Used in colored applications, Imerys wollastonite provide:

  • Reduced compound viscosity 
  • Equivalent hardness
  • Good aging properties
  • Low compression set

We recommend our Wollastocoat® range for FKM applications. 

Imerys flux-calcined diatomaceous earth such as our CelTix product is also suitable solutions for both white and colored FKM applications where it provides low compression set and reduced oil swelling.

Partitioning Agents

Imerys minerals are an excellent anti-sticking agent in compound handling, processing and part manufacturing. Coarse and platy kaolin and carbonate grades are ideal to prevent unvulcanized rubber-to-rubber adhesion in tire demolding, the manufacture of rubber goods and for cable compounds.

We recommend:

  • Imerseal 75 - a surface modified, ultra-fine particle size carbonate
  • Glomax® LL - a medium particle size calcined kaolin

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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