I think fire-brick is called "fire-brick" for a good reason. They are made with special fire clay. Considering how hot an arch can get, I wouldn't want to try anything else. Some oil-fired rigs get by with refractory-blankets, but they don't run near as hot and are better controlled. Also usually used with sap run through an osmosis rig first to get half the water out and yield a shorter boil time. I suppose you're using wood?
I know my arch gets so hot it will bend lengths of rail-road track. I know because I've used them many times for temporary supports until they got hot, bent, and dropped. I've also seen standard 8" x 16" concrete blocks blow to pieces in a hot fire. Can't see how "patio" blocks would be any better.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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