Ceramic tiles: terms and definitions

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Question 1

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

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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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Nominal size - Size used to designate a product.

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

Question 3

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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Ukraine - Piastrella

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Spain - Gres Porcelanico

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Portugal - Granito Porcelanato Ceramica

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Germany – Porzellan Steinzeugfliesen

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Italy – Gres Porcellanato

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Russia – ceramic granite or porcelain stoneware

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England – Fully Vitrified Porcelain Tiles or Vitrified Stoneware

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France - Gres ceramic

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Poland - Super Gres

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

Question 4

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

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

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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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Transparent glazes are also called enamels.

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

Question 5

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

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

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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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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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Material on this issue is presented in standard EN 14411 .

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