Ceramic tiles: terms and definitions

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Question 1

Standards, articles and books use specialized ceramic tile terms. Below are such terms and their definitions. Which pairs - term and definition - correspond to reality?

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Extruded ceramic tiles and slabs - Ceramic tiles and slabs cut to a specified length from a strip formed by an extruder from a plastic mass.

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Glaze - A thin glassy sintered layer covering the surface of a ceramic tile or slab that is waterproof

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Angobed Surface - A thin layer of clay slurry applied to the surface of a ceramic tile or slab that has a matte appearance and may be permeable or waterproof.

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Ceramic tiles and slabs with an engobed surface are considered glazed.

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Semi-dry pressed ceramic tiles and slabs - Ceramic tiles and slabs produced by pressing a powdered mass into molds under high pressure.

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Water absorption (E) - Water absorption is determined as a percentage by mass in accordance with EN ISO 10545-3.

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Material on this issue is presented in standard EN 14411 .

Question 2

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

Question 3

Ceramic tiles and rectangular slabs come in a range of sizes. The names of these sizes and definitions are given below. Which pairs - term and definition - correspond to reality?

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Modular size - Dimensions of ceramic tiles and slabs determined on the basis of module M, as well as their multiple and divisible, with the exception of tiles and slabs with a front surface area of ​​less than 9000 mm2.

NOTE See ISO 1006, where 1M = 100 mm.

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Technological size (W) - A size established for the manufacturing process of ceramic tiles and slabs, which must correspond to the actual size within acceptable deviations.

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Nominal size - Size used to designate a product.

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Non-modular dimensions - Dimensions that do not take into account the modular (M) structure.

NOTE See ISO 1006, where 1M = 100 mm.

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Actual size - The size obtained by measuring the surface of ceramic tiles and slabs in accordance with EN ISO 10545-2.

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Coordination size (C) - Technological size, including the width of the seam.

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The dimensions of tiles and slabs of other shapes are determined by the largest size of the rectangle in which they are inscribed

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Material on this issue is set out in standard EN 14411 .

Question 4

The existence of ceramic slabs with different types of surfaces is the result of successful experiments by manufacturers. The most popular of them can be considered surface polishing (with its variations). Select the correct definitions or statements.

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A polished surface is obtained by special matte polishing.

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Tiles with a matte surface are not only the most affordable, since they do not require additional processing, but also the most durable.

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To obtain polished tiles, their surface is polished with special diamond nozzles using a large number of chemicals.

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When exposed to water, polished tiles become very slippery.

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Polished porcelain tiles are less slippery than polished ones, but due to the smooth surface of such tiles, they are easy to clean.

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Polished Surface - The surface of glazed or unglazed ceramic tiles and slabs that is polished at the final stage of manufacture to impart shine.

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When polishing, the topmost “sintered” layer is cut off. As a result, polished porcelain stoneware is slightly inferior to matte in terms of performance characteristics, in particular, wear resistance.

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A matte surface is more slippery than, for example, polished or glazed.

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The tile that comes out of the kiln and is not subjected to additional mechanical treatment after firing has a matte surface.

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Material on this issue is presented in the article Porcelain tiles - many faces and diversity .

Question 5

Ceramic tiles and slabs are used mainly for flooring and wall cladding. As a rule, they are molded at room temperature using the extrusion method (method A) or the semi-dry pressing method (method B). Indicate what types of ceramic tiles are molded using the semi-dry pressing method (method B).

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Cottoforte

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Cotto (terracotta)

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Porcelain tiles

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Majolica

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Gres red

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Clinker

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Information on this issue can be found on the forum Classification of tiles and area of ​​use .

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