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Fudugazi 05-16-2006 06:45 PM

Wondering what kind of supplier carries this stuff Fudugazi

james 05-16-2006 09:58 PM

Fire clay
Fire clay is a clay made up of aluminate and silica. You can buy it in a 50lb bag from your local brick supplier, but probably not Home Depot. It has many of the characteristics of a true refractory mortar, such as its ability to withstand high heat. That is why you add it to a traditional mortar to withstand heat. When you mix fire clay with portland cement, you get a mortar that is more heat resistant than concrete (portland cement with a sand and gravel aggretate), but much less resiliant or thermally conductive than a true aluminate mortar. Don't forget that portland cement burns out at a relatively low temperature.

Here in Sonoma county, you can get fire clay from our big, local masonry supply company, SBI -- who is also a Forno Bravo oven dealer :).

For an easy to work with (but less resilient) mortar:

1 part portland
3 parts sand
1 part lime
1 part fire clay

For a more permanent, but harder to work with mortar:

1 part calcium aluminate
3 parts sand
1 part lime
1 part fire clay

For an easy to use, long lasting mortar (but a little more $), you can buy Refrax from Forno Bravo.

It's a real, pre-mixed refractory mortar.


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