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Coating 1200deg c pipe insulation with refractory for stove riser

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Just wondering if anyone has tried coating calcium perlite foam pipe insulation sections to form a riser. We had some damaged sections at work that were no longer any good to use. So I bought them home tried using them for a riser but direct flame contact melted out the binder and it fell to bits. It's rated to constant temperature of 1000 deg c with max temperature of 1200 deg c for 2-3 hour duration. It is awesome insulation just doesn't like fire. My thought is mix up some calcium aluminate refractory mortar/cement to coat the inside of the two halves of the insulation. Anyone tried this sort of thing. Since the calcium aluminate sticks to everything ( including the stuff you don't want it to). I was thinking a 15 to 20 mm coat. After curing wire the two halves together and I'll have a nice 600 mm riser for my 4 inch batch box outdoor bath heater. Thoughts criticism and cheeky comments, wanted, appreciated, and returned.

Cheers in advance
Russ the kiwi nutter
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