Light weight silica bricks are also called silica insulation bricks. They are lightweight refractory materials with a silica content of more than 91% and a bulk density of less than 1.2g/cm3. The refractoriness and load softening temperature are similar to those of ordinary silica bricks with the same composition. However, due to the large number of pores, the compressive strength, slag resistance, corrosion resistance, etc. are not as good as those of ordinary silica bricks, but the thermal shock resistance is improved.