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Alumina Content - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Alumina Content

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  • Alumina Content

    Hi. I was wondering if anyone could help me understand the pros and cons of Alumina content in casting refractory. I have read FB page on firebrick and how they recommend medium grade firebrick with 30% Al. I have also read the higher content can cause the oven to get too hot for bread. If I am just making pizza would the higher content be better? I also see that in the FB precast they use 80% Al precast. Is Al in precast differ from Al in firebrick? Is there any issue with the 80% Al in the precast and using firebrick with 30% on the floors? Maybe I am reading too deep now just let me know to stop over thinking.

  • #2
    Re: Alumina Content

    If you were building the first oven ever built, it would be wise thinking. In reality, the margin of error is so large that it is almost impossible to botch it such that your oven will not work for it's intended use. Use what you can find locally, build as accurately as you efficiently can, and cook some pizza.

    Or, just buy the kit or premade and cook that much faster. Either way, good luck.


    • #3
      Re: Alumina Content

      There are literally thousands of refractory products. Happily, they are made by companies that keep applications engineers on staff to answer questions just like these. Give the company in question a call, and tell them you have a technical question. And let us know what you find out.
      My geodesic oven project: part 1, part 2


      • #4
        Re: Alumina Content

        One quick note. Our castable recipe for the FB ovens is 80%+ Alumina and Silica (not just alumina). The make-up of the dome is basically the same as the firebrick floor -- with very little non-refractory impurities. We use large Medium duty firebrick tiles for the FB oven cooking floors (38% alumina).

        Check our Firebrick page for more info. The ultra high duty firebricks are for blast furnaces, and we are baking pizza, not melting metals. :-)

        Brick Oven Design | Choose the Right Brick Oven Brick

        Pizza Ovens
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        • #5
          Re: Alumina Content

          Dmun, it is true that they have technical people on staff, but I would caution you that unless you can articulate a specific question, and understand the answer as given, that you will not get much help as an individual from the manufacturer. It is usually better to ask your questions of the distributor, again with clear, specific questions. If they do not know your answer, they are in a better position to work with the manufacturer to figure out what you are trying to achieve and how best to do so.


          • #6
            Re: Alumina Content

            The question of alumina content is not a question of temperature. The bricks will (if they are heated to saturation) reach the same temperature regardless of their specification (assuming that you have a well insulated oven where the insulation will control the heat loss). The important issue is the bricks resistance to erosion (weare and tear) during repeated heating (hardness) and their specific weight (which will determine their heat capacity).