Refractory mortar query

[Filthymutt]

Finally found a place that will sell in small quantity.

Can anyone tell if this stuff will be ok? Or is the Alumina content too high? I read that with firebrick if the alumina content is too high that meant the temps will get too high for pizza. But if I am using medium duty brick with high alumina mortar is it going to make a big difference?

refractory mortar for kiln and furnace

Min. Order: 1 Barrel

FOB Price: US $0.1-0.5 / Barrel
Place of Origin: CN;SHN ;
Al2O3 Content (%): 70% ;
Model Number: refractory mortar ;
Refractoriness (Degree): Common (1580?< Refractoriness< 1770?) Pretty sure that is in Celsius

Bob

[brickie in oz]

Re: Refractory mortar query

I read that with firebrick if the alumina content is too high that meant the temps will get too high for pizza.

This comes up from time to time and I fail to see how it will get hotter, if you stop feeding in fuel and it gets hotter and hotter patent the idea as you will become very rich.

Kilojoules in equals Kilojoules out minus some losses, the oven simply cant keep on getting hotter.

[david s]

Re: Refractory mortar query

It is the density of the firebrick that allows it to heat faster and store more heat. Low density is more insulating. Generally the higher duty bricks are denser, fired to a higher temperature and contain less silica. The high density also means they're harder to cut. The low silica content has more to do with the really high temperatures (that we get nowhere near) when silica being a glass former tends to melt and create problems.

[Filthymutt]

Re: Refractory mortar query

So, then no dif? High density mortar with lower density bricks, no problemo with mixing the two?

[david s]

Re: Refractory mortar query

No it should not make a difference. The mortar hasn't been fired so it won't be denser than the bricks anyway. Refractory mortar is overkill IMO because it is designed to sustain temps about three times what we use. It is trickier to use because it goes off faster, the home brew is quite suitable for our purposes, works well, easy to apply and is cheap.

[Filthymutt]

Re: Refractory mortar query

Noted thanks. I'll check around some more to see if I can get some fire clay in small quantity.

[Gulf]

Re: Refractory mortar query

Bob,
I believe that I read that you could get the wet saw. If you do, and you are using firebrick,: Cut your floor bricks and precut a couple of rows of your dome. Screen the collections in your wet saw's pan and use that as a substitute for the fire clay. By doing this you can stay ahead of the game and you will end up with more fire clay than you need .

[Bec1208]

Re: Refractory mortar query

Bob,
I believe that I read that you could get the wet saw. If you do, and you are using firebrick,: Cut your floor bricks and precut a couple of rows of your dome. Screen the collections in your wet saw's pan and use that as a substitute for the fire clay. By doing this you can stay ahead of the game and you will end up with more fire clay than you need .

Here is a pic of the brick sludge left in the saw pan after cutting floor and about three courses.