I have become quite interested in building one of these ovens, and have been pricing out materials. While pricing out firebrick, I explained to him what I was doing and he warned me about the high silica content of the brick being a hazzard to cook food on, and told me that commercial refractory cement has atleast twelve different oxidants in it, and would not recemmend using any of it, and to try and find low silica bricks and special mortar. Browsing this site and the net I have found no mention of these concerns and am wondering if he is just being over cautious or whether there is some legitimacy to this?
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