Pure hollow sphere corundum materials can also be used to line kilns in which aggressive atmospheric-related corrosion of the brickwork is expected.
Whenever there are halides, for instance fluorine or chlorine, or even a high concentration of hydrogen in the atmosphere, these materials in particular are a good option for durable and resistant lining. They can be used at the front and also as insulation in the rear brickwork. In extreme cases, there is also an almost SiO2-free version of the material available.