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 aluminosilicate grades (Mulgrain®, Molochite™ and Super Ecca Chamotte) suitable for a range of applications.

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



Imerys Refractory Minerals is the world’s leading producer of calcined products for the refractory and foundry industry.
Our brand portfolio is comprisedof the well-known Mulgrain® and local sized Super Ecca Chamotte lines.


Super Ecca 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.

Mulgrain® grains and flours are superior ceramic refractory mould media. These grains are precisely sized through a series of screens, and custom blended to obtain a series of coarse to fine sizes. During screening the grains are de-dusted to ensure a virtually dust free stucco.

Individual technical datasheets 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 its 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, France, plant.

Kerphalite KF for foundry sands.
Kerphalite KF for foundry coatings.



Molochite™ is the standard “back-up” refractory material used in the production of investment casting shell moulds. 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

Individual technical datasheet is available on demand.



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


For standard grades:

For special products:
Individual datasheets are available upon request.