... Fire-caly bricksThe main chemical components:Al2O3 content is 30%-48%, SiO2 content is 50%-65%, and a small number ... of alkali metals, alkaline earth metal oxides, etc. Mineral composition is usually mullite, quartz and glass phase. Its ... 0.2-0.5 Apparent porosity,%≤2224262426242628Compress strength,N/mm2≥3025202015201515Thermal shockresistanceN-2b, N-3b must be tested and list the ...