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Old 02-27-2018, 06:48 AM
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Join Date: Feb 2018
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Most use out of homemade refractory

You want to use materials that resist water and moisture as much just do t use materials that absorb water really fast if you do just be sure to fire it to draw the moisture out out. I somewhat don't recommend using Portland cement because I shrinks and contracts when it hardens. The best refractory materials you can get are high temp firebricks and kaowool. You can get kaowool to reach temperatures of 3200 degrees Fahrenheit, firebricks can reach 2600 degrees.
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