| 摘要 |
The object of the present invention is to provide a refractory having sufficient corrosion resistance against alkali vapors and excellent thermal shock resistance which is light in weight and suitable for glass tank furnaces. The present invention provides a high-alumina fused cast refractory comprising from 94 to 98% of Al2O3, from 1 to 6%, in total, of Na2O and/or K2O, which is mainly composed of alpha-Al2O3 crystals and beta-Al2O3 crystals, has pores dispersed in it and has a porosity of from 5 to 30%.
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