As such they are extremely useful to hobbyist blacksmiths and machinists who wish to build their own forge or foundry.
Ceramic fire brick forge.
The answer to this question has a few answers.
They have low thermal conductivity and are excellent for forging or fireplaces.
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A firebrick or refractory brick is a ceramic brick made from refractory material that can withstand high temperatures.
So which fire bricks should you.
Dense firebrick is a heat sink.
Yes you can line a forge with soft insulating firebrick.
I would recommend using a brick with a 2800 f temp rating.
Kiln bricks also referred to as fire bricks or refractory bricks are made from ceramic refractory material that can withstand extremely high temperatures such as those achieved in kiln firings.
I would not recommend using hard dense firebrick to line your forge.
Refractory materials are non metallic ceramic materials that can withstand high temperatures.
Firebricks are used to line the inner surfaces of furnaces kilns and forges.
The bricks typically line the inside of a kiln furnace fireplace etc and serve as great insulators making heat loss minimal and energy use.