I would recommend using a brick with a 2800 f temp rating.
Ceramic fire brick forge.
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Refractory materials are non metallic ceramic materials that can withstand high temperatures.
They have low thermal conductivity and are excellent for forging or fireplaces.
Yes you can line a forge with soft insulating firebrick.
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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.
So which fire bricks should you.
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The answer to this question has a few answers.
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Dense firebrick is a heat sink.
Can i line a forge with firebrick.
The bricks typically line the inside of a kiln furnace fireplace etc and serve as great insulators making heat loss minimal and energy use.
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Firebricks are used to line the inner surfaces of furnaces kilns and forges.
As such they are extremely useful to hobbyist blacksmiths and machinists who wish to build their own forge or foundry.