Production plant 1 MKZ Fireclay Factory is located in Rájec-Jestřebí in South-Moravian Region and it has been built in 1908 as brickyard and rebuilt in 1911 to produce the fireclay. Plant produces and sells fireclay refractories and high alumina refractory shaped products. These products are used mainly in foundries, stove-building, building industry and also in manufacturing of industrial furnaces. Fireclay products include three production branches: fireclay bricks for building industry, stove fireclay and casting fireclay. Fireclay and high alumina products for foundries (casting fireclay, foundry holloware) are used in gating systems for metal casting. Stove fireclay manufactured from both plastic mass and crumble mass are used as construction and non-construction linings of fireplaces, chimney-places and cauldrons. Fireclay and high alumina bricks are manufacture in more qualities for for use in very high temperatures up to 1 730 ° C. Special branch production line is manufacturing of heating elements – special fireclay shaped products with pressed-in electrical heating spiral – used as parts of ecological radiators for heating in habitable rooms.

Production plant 2 MKZ Refractory Masses is located in Rájec-Jestřebí in South-Moravian Region and began the production in 1989. This production plant focuses mainly on the production of gunning and ramming masses for blast furnaces (tap hole clays), including masses and accessories for foundries and steel works. The additional range of the plant includes dried foundry sands.

Production plant 3 Keravit is located in Ostrava-Vítkovice, in Moravian-Silesian Region. It is a traditional refractory ceramic materials producer. Since its founding in the 1th mid. of 19th century, the plant focused on meeting the needs of metallurgical steel making operations in Vítkovice iron works, in particular in the range of production fireclay shapes for gating systems. This plant is European leader in production of high alumina gating systems for steel ingot castings. Plant is also producer of wide range other refractories, produces structural refractory bricks for common and special industry needs and also produces unshaped refractories.

This production plant founded in 1947 produces mainly wide range of goods based on graphite-fireclay compound and destined for the foundry and steel industries (graphite stoppers and nozzles, graphite crucibles, SiC monoblock stoppers, ladle bowls, pyrometric tubes). The other important production lines are heat-insulating moulded blocks IZOSPAR (light fireclay feeder bricks) mainly for foundry industry and variety of other thermal insulation shapes.