Fire bricks versus 'Pressed Reds'

[nissanneill]

Adrian,
the ovens are only designed to reach say a round figure of 500˚C whereas a kiln can be required to go to over 1000˚C. I have a Ward Kiln that is used for ceramics and pottery which I use for annealing and firing ceramic inks on glass and pottery. The high fire inks are fired at 860˚C so the bricks need to be better than the common reds or in your case the creams.
Back to your ovens. If the brick is fired at over 1000˚C and is only going to achieve a half that, then it will perform OK.
As RT posted earlier, the thermal shock of continually heating these bricks from cold to baking temps over a 20 or 30 year period, say each week or fortnight, MAY show sign that a firebrick may not.
I would not use a brick that crumbles when hit with a hammer, but I would use one that breaks/splits.

Cheers.

Neill

[Johnny the oven man]

For anyone wanting 40% alumina firebricks and are willing to take a full pallet lot, we can offer @ $3 each. Melbourne based.

[bimbo]

how many are in a pallet load johnny?

[Johnny the oven man]

320 pcs sized 230x115x75.