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Refractory mortar query - Forno Bravo Forum: The Wood-Fired Oven Community

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Refractory mortar query

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  • Refractory mortar query

    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
    Last edited by Filthymutt; 05-19-2013, 07:27 AM. Reason: Addition
    Bob

    Always ready for pizza

    http://www.fornobravo.com/forum/memb...ing-build.html

  • #2
    Re: Refractory mortar query

    Originally posted by Filthymutt View Post
    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.
    The English language was invented by people who couldnt spell.

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    • #3
      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.
      Kindled with zeal and fired with passion.

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      • #4
        Re: Refractory mortar query

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

        Always ready for pizza

        http://www.fornobravo.com/forum/memb...ing-build.html

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        • #5
          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.
          Kindled with zeal and fired with passion.

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          • #6
            Re: Refractory mortar query

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

            Always ready for pizza

            http://www.fornobravo.com/forum/memb...ing-build.html

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            • #7
              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 .
              I don't care what folks say behind my back........They are either braggin' or.......lyin'


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              • #8
                Re: Refractory mortar query

                Originally posted by Gulf View Post
                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.
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                http://www.fornobravo.com/forum/f6/3...lly-19181.html

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                Selected pictures of the build.

                https://picasaweb.google.com/1168565...g&noredirect=1





                sigpic “In theory, theory and practice are the same. In practice, they are not.” ― Albert Einstein

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