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D70 fire brick - Forno Bravo Forum: The Wood-Fired Oven Community


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D70 fire brick

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  • D70 fire brick

    i have located some free used firebrick. they are 4.5 x 9 x 3 and have d 70 embossed on them. does anybody know what this means? also they have been outside uncovered for 15 years. i live in central canada and can get cold -30 f. to +100 f. does anyone know if they are they worth using?


  • #2
    Re: D70 fire brick

    I think you have a duralite 70 firbrick manufactured by Chicago Firebrick - no longer in business. This is a 70 % alumina brick that is around 160 pcf. THese brick will take a long time to heat up, and a long time to cool down


    • #3
      Re: D70 fire brick

      Nothing beats free. These are high-duty expensive bricks, and I wouldn't advise anyone to go out and buy them, but they will work fine. They are just a little harder to cut than the ones from the brickyard.

      Good luck with your project - keep us posted.
      My geodesic oven project: part 1, part 2


      • #4
        Re: D70 fire brick

        thanks for the speedy replies. i have completed the hearth slab and hope to start on the brick hearth next month. i bought new low duty firebrick for the hearth and i think i will use the D 70 for the rest of the oven. thanks again for your help.