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[′fīr ‚klā]
A clay that can resist high temperatures without becoming glassy.
Soft, embedded, white or gray clay rich in hydrated aluminum silicates or silica and deficient in alkalies and iron.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



refractory clay or kaolinite, which when roasted loses plasticity, the chemically bound water is removed, and a certain degree of sintering occurs. The Russian term for “fireclay”—shamot—is also applied sometimes to certain other initial materials used in the production of refractories, roasted to obtain pelletized powders (often in a clay mixture) and to stabilize the properties of the material (high-alumina, corundum, and zircon fireclays).

Fireclay is obtained by roasting—in rotary, shaft, or other furnaces at temperatures of, for the most part, 1300°-1500°C—the raw material, which is in the form of natural pieces or briquettes prepared in belt, roller, and other presses. The degree of sintering of fireclay is characterized by water absorption, which is usually between 2–3 and 8–10 percent, but can be as high as 20–25 percent for “low-roasted” fireclay. After fragmentation and grinding, fireclay is used as a component (to reduce plasticity and shrinkage during drying and roasting) of bulk fireclays in molding articles (or correspondingly, high-alumina and other refractory materials). It is also used in the production of mortars and bulk gunite and as an aggregate in refractory concrete. In the mid-20th century, fireclay came to be used in sculpture, primarily for small statuettes.


Khimicheskaia tekhnologiia keramiki i ogneuporov. Moscow, 1972.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
I've found that a mix of 40 gallons of sand (eight 5-gallon buckets) and 13.5 gallons of powdered fireclay (a little over two and two thirds 5-gallon buckets) produces an oven that meets my needs.
Fireclay was used for the crucibles they melted glass in, using a combination of sand, red lead, potash and saltpetre, heating the combination to around 1,400 degrees centigrade." The Glasshouse site has also had a connection with glass-making throughout its history, according to Mr Dury.
RedArt 25 lbs fireclay 25 lbs ballclay 5 lbs fine grog 5 lbs medium grog 5 lbs coarse grog 1 lbs flint 1 lb talc 2 handfuls of nylon fibers Add 1 lb Iron Oxide for colour boost if desired Laura-Harris Gascogne has travelled most of her life, which includes having lived on a sailboat during her youth.
Developed adjacent to the Fireclay TRAX Station, the Birkhill community incorporates LEED Neighborhood Development criteria for density, proximity to public transportation, infill development and the incorporation of neighborhood parks.
"We have been installing Fireclay Tile for years," says Laura Ferrell.
The 31/2-mile journey begins at the east end of the town on the shores of the River Forth before heading up into the hills at Birkhill, where there is a fireclay mine, also open to the public.
Cast in fireclay and bronze, it allows gas flames to flicker through and around it, so can also be used in winter.
During the past five years, however, the group has been streamlined, and the core business is now open cast mining to recover both coal and fireclay for brick manufacture.
The local lad was killed aged just 35 when he tried to tackle a blaze at Ferguslie Fireclay Works.
Banks's website says that its plans to extract 800,000 tonnes of coal and 400,000 tonnes of fireclay from the site "provides an opportunity to mine a nationally significant amount of fireclay for house building and high quality coal for use as a raw material by industries such as steel works and cement manufacturing".