What Kind of Bricks Are Used in a Fireplace?

You should only use a special type of brick, called firebrick, fire brick or a refractory brick, to make a fireplace. Normal bricks cannot stand up to the continued high heat inside a fireplace and will crack.

In order to create firebricks, a special mixture called fire clay must be created from a mixture of silica, aluminum oxide and other materials that stand up well to high temperatures. The clay is then baked in a kiln until vitrified.

The refractory properties of firebricks makes them very popular for a variety of applications. Not only are firebricks useful in fireplaces for people's home, but also for industrial furnaces, steel refineries and even as insulating tiles for the space shuttle.

Firebricks are rectangles usually measuring 9 x 4.5 x 2.5 in. This is the standard size, but it may vary as they are adapted for specific applications.

Do not attempt to build a fireplace out of normal bricks. The bricks could crack under the heat and it could endanger the integrity of the whole fireplace and collapse.

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