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Fireclay is indeed an industrial term. You might be able to find it at companies who sell pottery and kiln supplies; at least you can where I am. You want the finest "screen" they have; ie, the smallest, finest particles.
"Made are tools, and born are hands"--William Blake, 1757-1827
Thanks for the quick reply Wiley and CanuckJim.
I did find some at Seattle Pottery. $10 for 50lbs. Not sure if that is expensive or not, but one more item off the list and I'm ready when I finish off the insulation layer of my hearth.
Re: Where to purchase Castable Refractory cement in Seattle?
Is there anywhere in the Seattle-Bellevue-Renton-Redmond area that carries a castable refractory cement (mortar)?
(I need to fill a fairly thick area, up to 2" thick, maybe 24" wide x 10" high, and I don't want it to crack, so ordinary refractory won't work. It's in a hard-to reach place, filling a gap inside a two-layer, partly-rusted firebox, so I can't use firebrick. I've thought of using a high-temp cement like a Class G/ MSR HSR, but am not sure if I can buy 10-25 lbs here.)
I'd like to get this in the next day or two if possible, without paying too much. So I don't want to wait for shipping from an online place.
Or is there a reliable recipe materials I can buy in stores here? (I've seen several recipes online that look pretty dubious to me.)