Studies have shown that clay with a high content of quartz SiO 2 = 65 - 72%, calcium oxide CaO = 10 - 15% and Fe 2 O < sub> 3 = 8 - 12%. Due to the crystallization of mullite in the samples under study, the bricks have increased durability. Wollastonite, formed due to the increased content of CaO in the clay, creates a dense framework that prevents changes in the previous volume, i.e. noticeably reduces stresses and shrinkage of ceramic products.
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