1)It should not affect the service life of the entire refractory masonry;
2) For high-temperature furnaces that work continuously, general large-area insulation is reasonable and can reduce heat loss. However, for some special areas, such as open hearth roofs, insulation can reduce the service life. For periodic working furnaces, regenerative heat loss is a major factor in heat loss. Insulation can increase the temperature of the masonry and increase the heat of regeneration. Therefore, it is determined whether the regular working furnace should be insulated after calculating the heat storage and heat loss.
3) Because insulating bricks have high porosity, they cannot withstand excessive loads and should not be in direct contact with molten metal, slag and high temperature dust.
4) Insulation refractory bricks have low strength. Brick joints and expansion joints should be properly disposed to avoid damage due to volume expansion. Insulating refractory bricks should not be subject to strong mechanical vibration, shock and friction;
5) Since the insulating brick has a large reheat linear contraction, the maximum working temperature should be less than 100 Centigrade than the firing temperature.