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Re: Firebrick cracks

From the WFO board

Posted by Rado (

In Reply to: Firebrick cracks posted by Giles

Hi Giles,
I know what cracks you mean, don't worry about them. They are cracks only in top surface. That's how some firebricks are manufactured - when formed the soft clay is smooth without small stones but just on surface and then on cooling down after they were fired a bit higher these cracks happen at around 230°C. Same like glaze cracks in pottery. Some B grade firebricks cooled down probably faster if in cooler spots in kilns, next to the walls, door, etc. Other bricks are fired larger then cut to exact size. The clay is same.

Sort out best bricks for arches. You can cut worst brick in half through one crack if you want, wash dust off and see it inside. Or do you want me to take a photo of such firebrick and post it to this forum for you to see and confirm if it's the same what I talk about??? I can do it if it helps.

How much did you pay for firebricks bricks and freight, to what destination? Firebricks last more then hundred years, very good-return investment! r

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Re: Firebrick cracks

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