The mineral composition of silica bricks is mainly tridymite and cristobalite, with a small amount of quartz and glass. Tridymite, cristobalite and residual quartz have a large change in volume due to crystal form changes at low temperatures, so the thermal stability of silica bricks at low temperatures is very poor. During use, it should be heated and cooled slowly below 800℃ to avoid cracks. Therefore, it is not suitable for use in kilns with rapid temperature changes below 800℃. It is mainly used for the partition walls of the carbonization chamber and combustion chamber of the coke oven, the regenerator and slag chamber of the steelmaking open hearth, the soaking furnace, the refractory materials of the glass melting furnace and the ceramic firing kiln, etc. The vault and other load-bearing parts of the kiln. It is also used for the high-temperature load-bearing parts of the hot blast furnace and the top of the acid open hearth furnace.