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IMERYS is a major supplier of high quality minerals to the rubber industry throughout the world.


Our portfolio for rubber includes ultrafine kaolin, calcined kaolin, surface treated calcined kaolin and ball clay.


Calcined kaolin offers superior reinforcement, excellent extrusion and compression set, all important properties to the designer of rubber compounds and articles. Calcined kaolin is chemically inert and our grades have low heavy metal content properties which are beneficial when making pharmaceutical stoppers.


When included in cable insulation compounds, calcined kaolin and surface treated calcined kaolin improve mechanical and electrical properties, reducing energy losses in power transmission. Our range includes grades for use at all voltage levels, Polestar 200R for low voltage cables, through Polarite 103A for medium voltage, to the world leading Polarite 503S for high and very high voltage cables.


Kaolin offers semi-reinforcing properties in most types of rubber compound, offering the formulator an alternative to more expensive synthetic materials. Kaolin also gives barrier properties which are beneficial when formulating compounds for hoses and gaskets.


Ball clay, offers more reinforcement than Kaolin, as a result of it’s finer particle size. Often referred to as hard clay, it gives excellent compression set and abrasion resistance. A common application for ball clays is in the shoe soling and rubber floor mat industry.


For rubber applications that do not require the mechanical properties offered by calcined kaolin, kaolin or ball clay, calcium carbonate is often added as a filler. We have a range of calcium carbonates from production sites around Europe allowing us to offer these materials cost effectively.

All of our products are supported by a high standard of technical service, product development and research from a team of highly experienced scientists and specialists in the rubber industry.


Product Related Literature

PDF fileImerys Rubber Market Brochure [2.5MB]

PDF fileImerys Rubber Tyres Brochure [3.9MB]

Related Topics

BulletElastomer Reinforcement Using CelTiX™

BulletKaolin in Technical Rubber


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©Imerys Minerals Ltd. 2012 | Registered office: Par Moor Centre - Par Moor Road - Par - Cornwall - PL24 2SQ UK | Company No: 269255