Firebrick is the type of brick used to make kilns, it’s a soft white refractory material that stands up to high heat. In my area, you can buy them through the local classified ads for about $3 to $5 each. I use them for a number of things, one of which is sawing into custom slump mold shapes. When doing production work, I may need 5 or 6 of one kind of simple mold at a time, and it makes sense to cut them myself if I can.
Firebricks contain silica, and are very dusty to cut. You should cut outside and ALWAYS wear a respirator when cutting fire bricks.
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