I have ordered 6 of these bricks for a foundry I am building. They came intact (a little off the corners) and worked great. I used a handsaw to cut them and only used 4 out of 6 for what I needed. With some Satanite refractory solutions, they endured multiple sessions, each lasting at least 4 hours. I raise the temperature above 2200 degrees and even melted steel once (2700 degrees). I'm happy with them and will eventually build a forge that uses more of these stones.
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