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Lightweight Porous Mullite Brick Properties and Applications Lightweight mullite refractory bricks to mullite main crystalline phase of high alumina refractory materials, general alumina content between 65% -75%. Mullite lightweight refractory bricks’ refractory temperature can reach more than 1790 ℃. Load softening starting temperature of 1600-1700 ℃. Good thermal shock resistance.



