The average temperature of the entire refractory brick layer increases after the insulation layer is built, which may adversely affect the service life of the high-temperature melting furnace lining. For this reason, some industrial companies build fewer or no insulation layers in order to ensure the service life of high-temperature melting furnaces. However, the majority of furnaces are still insulated.

  The thermal conductivity of the insulation material is low, generally below 0.3W/(m- degree ), and the porosity is generally above 50%. Because of the many pores, and thus the bulk density is small (less than 1.3g/cm3), the mechanical strength is low. These are common properties of various insulation materials.


  Heat-insulating materials according to the operating temperature, divided into high temperature (> 1200 degree , medium temperature (900?1200 degree ) and low temperature (< 900 ℃) three. According to the volume density of refractory materials is divided into general insulation materials (bulk density less than 1.3g/cm3), commonly used insulation materials (equal to 0.6-1.0g/cm3), and ultra-lightweight insulation materials (less than 0.3g/cm3).

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