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Ceramic plate heat riser

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Hi everyone!

I have to rebuild my heat riser. It was steel tube. Now I'm considering other material, and here's impossible to purchase vermiculite board. I'm thinking aboout ceramic plates. They sell 1000x1200mm but thickness is 1,5 cm. Does anybody have some experience or info about ceramic plates for heat riser? Index of thermal conductivity is 1,6 w/mK at 800°C, it seems OK, if I add perlite around. I don't know this material yet - is it appropriate for heat riser? Will it brake, could I make heat riser from this?

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