Imerys, Transform to perform



The Group


Glossary by alphabetic list :

For additionnal information

Glossary by branch :

  • Aggregate

    coarse or graded material, or any size fraction of it above an arbitrary minimum, in a refractory product. Somewhat similar to civil engineering concretes, where aggregates will be rock.

  • Ball clay

    Very fine-grained ceramic clay, chiefly mined in Devon and Dorset (UK). Its plasticity makes it an essential component in certain ceramics, especially sanitaryware and tableware.

  • Bold roll tiles

    large format tiles used mainly on the lower pitched roofs in southern Europe. Typical examples are the “Romane” and “Meridionale” Tiles.

  • Bone china

    a thin and translucent chifrom a body containing bone ash, china clay and Cornish stone.

  • Ceramic body

    a blend of several ceramic raw materials, that together form the starting material used by potters to make ceramic articles.

  • Cordierite

    synthetic product made from alumina silicate and magnesium. Cordierite is extremely heat-resistant – up to 1,200ºC - and is used to make kiln furniture and technical ceramics, among other things.

  • Earthenware

    white ceramic, not translucent, not particularly durable, baked at about 1,150º. It is made essentially of clays to which are added feldspath and silica. It is a porous product that requires glazing.

  • Flat tile

    A flat tile is a roofing component made up of a clay slab with a batten hooking system (stubs or plates) on its underside and one or more fastening holes at its head. Flat tiles are usually rectangular in shape but some models have rounded or V-shaped lower parts.

  • Glaze

    surface-covering product made of the same materials as ceramic bodies. Enamel enhances and embellishes porcelain. It enhances resistance and the colors of earthenware and stoneware.

  • Gunning

    Method for applying refractory products via wet or dry projection.

  • Half-round tiles

    These roofing components look like conical gutters. They are used as undertiles when laid with their curved face downward or overtiles when the curved side faces upward.

  • Hip

    the meeting line of two inclined roof surfaces which meet at the external angle.

  • Injection

    Method for applying very fluid refractories (slurry) under pressure so that the product fills empty spaces or cavities.

  • Interlocking tiles

    roof tiles that fit as a result of special channels located at the head and side of the tiles. This type of tiles reduces the weight of the roof compared with conventional tiles (Roman or flat).

  • Kiln furniture

    Shaped parts made from refractory materials (cordierite, mullite or silicon carbide) that must provide good resistance to mechanical and heat shock and be as light as possible to save energy during firing.

  • Large format flat tiles

    these interlocking tiles are found typically on the large pitched and smooth slope roofs in central and northern France, whenever with a flat surface

  • Large format tiles

    interlocking tiles, with a coverage of 10 to 15 tiles per m2.

  • Porcelain

    very white ceramic, durable and translucent, fired at around 1,400ºC, used in tableware. It is made essentially of china clay, to which are added feldspar and quartz.

  • Pouring

    Method for applying concrete by gravitational flow. Depending on the concrete’s rheology, pouring can involve vibrators, rodding or self-pouring.

  • Prestressed concrete products

    Prestressed concrete products, mainly joists, are used for floor construction. Filler blocks are placed between each joist. These can be made from a variety of materials, including clay, which is the division’s specialty. In addition to joist, the range also includes structural beams, calculated for each use, which allows for quicker installation at the construction site.

  • Ramming

    Method for applying plastics using a rammer (a type of automatic power hammer)

  • Slags

    in metallurgical processes, non-metallic impurities or additives (fluxes) concentrate in slags, usually above the liquid metal. Their temperature and chemical composition often make them highly agressive vis a vis the refractories.

  • Small format tiles

    interlocking tiles, with a coverage of 17 to 20 tiles per m2.

  • Spray-dried bodies

    granulated ceramic bodies made by atomising slurry into a drying tower.

  • Stoneware

    ceramic used in tiles, tableware and sanitaryware. This product is intermediate between earthenware and porcelain. Its resistance to warping at high temperature allows large pieces to be fired (very useful in sanitaryware). Its components are the same as those of earthenware, except for certain specific clays. Stoneware may be porous or vitrous.

  • Vitreous

    any ceramic body fired to a sufficiently high temperature that is no longer porous or able to absorb water.

Imerys is based in over 50 countries and has 250 industrial sites.

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