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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.



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.
References in periodicals archive ?
There were a lot of issues that came up when we were hosted on a server," recalls Eric Edelson, vice president and owner of Fireclay.
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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.
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Fieldhouse Fireclay Works surrounded by the Deighton countryside epW0161 32
Bosses at Gateshead Council will consider a planning application to mine 1,000,000 tonnes of coal and 125,000 tonnes of fireclay on land south of Marley Hill, Gateshead.
Crushed, cast-off porcelain--150 tons of it, harvested, over the course of a year, from nearby landfills--provides a key ingredient in the Debris line from Fireclay Tile (fireclaytile.
Murray--With TRAX rumbling in the background, city, company and UTA officials broke ground on HAMLET HOMES' new transit oriented redevelopment project, Birkhill at Fireclay in Murray.
Figure 3 shows the relative time necessary to achieve the maximum green strength properties of western and southern bentonite and fireclay.