Ceramic tiles: terms and definitions

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Question 1

Gres porcellanato. Tiles with a light or colored base, plain (monocolor) or fine-grained with a compacted, vitrified shard, produced by pressing. The technical and commercial name for this type of tile in some countries is as follows:

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Portugal - Granito Porcelanato Ceramica

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Germany – Porzellan Steinzeugfliesen

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France - Gres ceramic

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Italy – Gres Porcellanato

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Poland - Super Gres

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Ukraine - Piastrella

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Spain - Gres Porcelanico

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England – Fully Vitrified Porcelain Tiles or Vitrified Stoneware

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Russia – ceramic granite or porcelain stoneware

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Material on this issue is presented in the article Unglazed tiles .

Question 2

Ceramic products can be divided into three groups:

  1. building ceramics;
  2. facing ceramics;
  3. art ceramics.

Which of the following products can be classified as veneer ceramics? 

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Roof tiles

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Tile

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Compositions, for example, a vase with flowers, a girl on a swing, etc.

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Brick

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Dishes

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Expanded clay

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Facing brick

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Ceramic tile

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Pipes

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Information on this issue is presented in the article Ceramic products, facing ceramics .

Question 3

Glazed ceramic tiles can be used to cover walls and floors. Which of the following statements regarding glaze are true?

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Glaze, consisting of frits only, is used only to achieve a shiny surface on some types of wall tiles.

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Glaze is a shiny or enamel glassy layer in the form of a thin film (1 - 3 mm).

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Frit is a special type of glass that, during the firing of the tile, melts and adheres tightly to the shard.

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The fragility of the adhesion of the glaze to the shard is expressed in the formation of a network of cracks in the glaze layer (cek) or the detachment of the glaze from the shard after firing and cooling.

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Transparent glazes are also called enamels.

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Transparent glazes are colorless and colored.

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The chemical composition of the glaze and the ceramic shard is different. Their thermal expansion also varies in size.

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Tsek is a type of glaze defect. This occurs due to the difference in the expansion coefficients of the shard and the glaze itself. The center has the appearance of web-like cracks.

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Material on this issue is in the article Glaze general concepts and classification .

Question 4

The variety of types of ceramic tiles produced is quite large. It ranges from traditional terracotta to tiles with complex chromatic textures that imitate non-ceramic materials such as glass, metal, and natural stone. Below are the names of the types of ceramic tiles and their descriptions. Which of them do you think are true?

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Faience . Glazed ceramic tiles with a porous and white base, press molded, double fired. Water absorption from 6 to 12%. The raw material is white clay, which after firing gives the shard a light tone. White sponge cake allows you to use transparent glazes or glazes in light colors. These tiles are of high artistic quality.

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Cottoforte . Double-fired glazed tiles with a porous, colored base, press-molded. Like majolica, cottoforte is a glazed tile with a colored porous base, but in terms of its raw material composition it is close to red gres (that is, a tile with a compacted shard). Water absorption ranges from 6 to 15%. Due to its high porosity, cottoforte is not frost-resistant. The average tile thickness of 10-12 mm is quite sufficient to accommodate the loads inherent in residential premises.

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Majolica . Double fired glazed tiles with a porous and colored base, press molded. Firing is carried out in two stages, first the shard is fired, then the glaze. Water absorption ranges from 12 to 22%. Accordingly, the tiles are not frost-resistant and are not highly durable.

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Ceramic granite . Tiles with a light or colored base, plain (monocolor) or fine-grained with a compacted, vitrified shard, produced by pressing. Water absorption <0.5%. The distinctive features of porcelain stoneware are strength, resistance to abrasion, chemical and biological influences, frost resistance, and high bending strength. At the same time, the tiles are not subject to aging and retain their original properties and are not affected by the environment.

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Cotto (terracotta) . Most often, unglazed tiles with a red and porous base, produced by extrusion. A mixture of different types of natural clay without special sorting and mixing. Cotto is an Italian name, generally accepted and well known to us - terracotta. The ratio to water absorption is determined by the raw material composition and process conditions and varies from 3 to 15%. Cotto tiles have a significant thickness from 15 to 25 mm.

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Clinker . Unglazed and single-fired glazed tiles with compacted shards, produced by extrusion. The raw material is a mixture of various types of refractory (fireproof) clays, quartz, feldspar, fireclay. Clinker belongs to the class of tiles with enhanced physical and mechanical characteristics associated with high-quality raw materials and production technology. This type of tile can also be called extruded gres.

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Gres red . Unglazed, red-burning tile with compacted shards, produced by pressing. The raw material is a mixture of red clays with quartz, spar and fireclay. Water absorption is less than 3%. It has high strength and abrasion resistance (abrasion resistance). Strength indicators are higher than those of natural stone.

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Gres . Gres is a name for ceramic materials that are characterized by a compact crystalline structure of a shard with partial vitrification (the process of transformation into a glassy mass), therefore tiles of this type are typologically classified as stone-ceramic tiles. Stone-ceramic tiles have a water absorption of <3%.

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Material on this issue is presented in the article Unglazed tiles .

Question 5

Unglazed tiles consist of one layer - a ceramic shard. The color is obtained from the raw material or is colored by metal oxides throughout the tile body (tile). The surface can remain untreated (natural) or be processed, taking on various surfaces: polished, honed, rusticated, structured, etc. Unglazed tiles include:

Score: 10 out of 10
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Clinker

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Extruded gres

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Gres red

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Majolica

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Cottoforte

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Cotto (terracotta)

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Gres Porcellanato (ceramic granite)

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Information on this issue is presented in the article Unglazed tiles .

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