Clinker brick

Clinker brick
Reemtsma cigarette factory in Hamburg by Fritz Höger

Clinker bricks are partially vitrified brick stones used in the construction of buildings.

Clinkers are burnt under temperatures so high that the pores of the fuel property are closed by the beginning sinter process. Thus they are considerably denser and therefore heavier than regular bricks. Clinkers hardly take up water and are very resistant.

In early brick firing kilns, the surface of the bricks that were too close to the fire changed into the volcanic textures and darker/purplish colors. They were often discarded, but around 1900, these bricks were discovered by architects to be usable, distinctive and charming in architectural detailing, adding the earthy quality favored by Arts & Crafts style designers. Modern brick-making techniques can recreate the appearance of these bricks and produce a more consistent product.

In the United States, clinker bricks were made famous by the Pasadena, California architecture firm Greene and Greene who used them (often in combination with native rocks) in walls, foundations, and chimneys.

The name "clinker" is also used for the hardened residue of coal fires, that can have a similar texture.

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Dutch / Low German Origins

Clinker bricks used to form family initials on a 1700s Dutch house in upstate New York. Click Image to Enlarge.

Clinker is sometimes spelled "Klinker" which is the original Dutch / Low German, word. The old onomatopoeic verb "klinken" meant "to sound", i.e. a "Klinker" is a "sounder". (These brick stones produce a specifically bright sound when hit with or against something, for instance each other ... also compare with the Standard German "klingen").

Clinker bricks are also known as hard Dutch paving bricks. In 18th century New York, the Dutch interspersed dark clinkers with regular bricks. Some used clinkers to spell out their family initials on brick dwellings. See Jan Van Hoesen House.

Technical Information

Clinkers consist of bits and ends, field-late and white-burning or red-burning clays. Through different mixtures of the raw ingredients, many varied colour nuances can be achieved. For the production of masonry units the source materials—clay and water—are mixed and formed industrially in a string extrusion process. For special purposes, for example the restoration of listed buildings, hand-formed clinkers are used. During the drying process, the water concentration decreases to approximately 3%. Then clinkers are fired at temperatures between 1100°C and 1300°C in the tunnel stove (earlier in ring stoves), in contrast to the 800°C to 1200°C temperature range seen with normal bricks.

Klinker in Germany

In Germany, clinkers are normed according to the German Institute for Standardization’s DIN 105 They differ between full clinker (KMz) with a density of 2.0 kg / dm ³ to 2.2 kg / dm ³ and high hole clinker (KHLz) with a density of 1.6 kg / dm ³ to 1.8 kg / dm ³. Because of their low porosity, clinker bricks are inferior thermal insulators, compared to normal bricks. Canal clinkers are normed according to the German Institute for Standardization’s DIN 4051. Clinkers are frost resisting and, thus are suited particularly for facades. The formats of the clinker stones are normed according to the German Institute for Standardization’s DIN 1053. Base for the different formats is the normal format (NF) with length 240 mm, width 115 mm and height 71 mm (other measures see baked brick). For facade layouts architects also order clinkers produced in special dimensions.

For use with facades, it is possible to cope varied shaped elements (e.g., clinker expressionism, see picture). Earlier clinkers were often used in civil engineering works, for example in bridge building , the construction of sewers and hydraulic structures, for mortar floodgates and hoppers or as paving stones for road construction.

Sculptor Ernst Barlach also worked with clinkers which then were produced according to his drafts, for example by the brickyard of Ilse Bergbau AG.

Peat fire clinker

A special colouring, above all green tones, clinker adopts if burnt with peat. Famous buildings with peat fire clinker are the Chile house and the Ramada Hotel in Hamburg. The last, still operating ring stove for peat fire clinker works is located in Nenndorf near Aurich (East Frisia). That clinker product is marketed under the name “Wittmunder Torfbrandklinker” (peat fire clinker of Wittmund).

Greppin clinker

A hard-burnt yellow clinker stone, which receives a closed surface by burning it at temperatures clearly higher compared to normal brick stones, is called Greppiner Klinker (clinker of Greppin). At the end of the 19th and in the early 20th century, such clinkers were mostly used to line facades of railway constructions.

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Look at other dictionaries:

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  • Clinker — Clink er (kl[i^][ng]k [ e]r), n. [From clink; cf. D. clinker a brick which is so hard that it makes a sonorous sound, from clinken to clink. Cf. {Clinkstone}.] 1. A mass composed of several bricks run together by the action of the fire in the… …   The Collaborative International Dictionary of English

  • clinker — [kliŋk′ər] n. [Du klinker, vitrified brick that clinks when struck < klinckaerd < klinken, to ring] 1. Archaic a very hard brick 2. a hard mass of fused stony matter formed in a furnace, as from impurities in the coal 3. Slang a) a mistake… …   English World dictionary

  • clinker — (n.) 1769, from klincard (1640s), a type of paving brick made in Holland, from Du. klinkaerd, from klinken to ring (as it does when struck), of imitative origin. The meaning stupid mistake is first recorded 1950 in American English; originally… …   Etymology dictionary

  • clinker — ► NOUN 1) the stony residue from burnt coal or from a furnace. 2) a brick with a vitrified surface. ORIGIN from Dutch klinken to clink …   English terms dictionary

  • clinker — I. /ˈklɪŋkə / (say klingkuh) noun 1. a. a hard brick, used for paving, etc. b. an overburnt face brick. 2. a partially vitrified mass of brick. 3. the scale of oxide formed on iron during forging. 4. a mass of incombustible matter fused together …  

  • clinker — I clink•er [[t]ˈklɪŋ kər[/t]] n. 1) min a mass of incombustible matter fused together, as in the burning of coal 2) bui a hard Dutch brick, used esp. for paving • Etymology: 1635–45; < D klinker kind of brick, slag II clink•er [[t]ˈklɪŋ… …   From formal English to slang

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