fire clay

American  

noun

1. a refractory clay used for making crucibles, firebricks, etc.

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fire clay British  

noun

1. a heat-resistant clay used in the making of firebricks, furnace linings, etc

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Etymology

Origin of fire clay

First recorded in 1810–20

Example Sentences

The fire clay joints are very thin, normally less than 1/8 inch in height.

From Seattle Times • Jan. 16, 2023

The firebrick is supposed to be set using fire clay.

From Seattle Times • Jan. 16, 2023

It’s mesmerizing to watch him skillfully use a thin coating of wet fire clay to create a fireproof joint between firebrick in fireplaces.

From Washington Post • Dec. 7, 2021

Skilled masons use a thin coating of wet fire clay to create a fireproof joint between firebrick in fireplaces.

From Seattle Times • Nov. 23, 2021

There were richly carved boxes which opened only under a full moon, and teapots that never grew cold, made from fire clay forged in the eastern islands.

From "Impossible Creatures" by Katherine Rundell