Imerys supplies the foundry industry with high-performance minerals and innovative solutions for investment casting, sand casting and core-making as well as refractory fillers for the production of foundry coatings.

Imerys Refractory Minerals is the world’s leading supplier of refractory materials for investment casting/ precision casting.
We supply a wide range of products including fused silica through Teco-Sil® and Mulgrain® aluminosilicate grades, which are suited to a range of applications .

We supply the sand casting industry with a broad range of specialty products, covering all common moulding techniques. Our product portfolio includes special sands (in particular Kerphalite™KF) for moulds and cores, bentonite, additives for sand reclaiming and refractory coatings.

In Europe our products are supplied through our sales team Imerys Refractory Minerals for Foundry Applications. To learn more about our products and our technical solutions for each application, visit the Imerys Refractory Minerals for Foundry Application website.



Imerys Refractory Minerals is the world’s leading producer of calcined products for the refractory industry. Our brand portfolio  is comprised of the well-known Mulgrain, Clayrac and CHK lines.


Clayrac™F and Mulgrain form our range of high-duty and super-duty chamotte. Our chamotte range is specially designed for the production of ceramic moulds for investment casting, where it can be used as stucco or flour in both alcohol and water-based processes.

Individual technical data sheets are available on demand.



In the modern sand casting process, special sands are used to improve casting quality and reduce the risk of defects. Due to low thermal expansion and high refractoriness, Kerphalite KF is the ideal solution for iron and steel casting free of veining and finning.


Kerphalite KF offers real compatibility with silica sand, has a bulk density of 1.7 g/cm3 and does not contain any significant amount of crystalline silica. The consistent particle size distribution is the result of a state-of-the-art sieving and milling process at our Glomel plant.
Kerphalite KF for foundry sands
Kerphalite KF for coatings



Molochite™ is the standard “back-up” refractory material used in the production of investment casting shell molds. Freedom from contamination makes Molochite an ideal filler for foundry coatings in iron, steel and aluminum castings.

The key benefits which Molochite offers to the Investment Casting Industry may be summarized as follows:

Unparalleled consistency of composition
Freedom from contamination
Consistency of size gradings
Compatibility with binders
Angular grain shape
Low dust content stuccos
Wide choice of gradings


Molochite for investment casting
Technical data sheet is available on demand.



Teco-Sil is used for its volume stability. Fused silica has an extremely low thermal expansion coefficient of so very tight tolerance castings can be produced.


For standard grades:

For special range:
Individual datasheets are available upon request.