Ceramic fiber is a type of porous material. The porosity of the ceramic fiber is more than 90%. Ceramic fiber transfers the heat mainly through the air in the pores. The air in the pores directly affects the thermal conductivity of the ceramic fibre. 

The stable heat transfer of the ceramic fiber lining mainly depends on the thermal insulation of the furnace wall. The refractory ceramic fiber lining has low thermal conductivity and the heat is blocked when it is through the furnace wall. This can significantly reduce the heat loss and achieve excellent energy saving effect. Ceramic fiber lining is suitable to be used in the industrial furnaces, especially in the intermittent heating furnace. The temperature of the intermittent heating furnace rises and falls frequently. This will spend most time to heat the furnace wall and waste a lot of energy. Because the heat storage of the ceramic fiber furnace lining is low, it greatly shortens the heating and cooling time of the furnace wall. And a large part of heat can be saved. 

The prices of energy have been increasing in recent years. In addition, environment pollution must be controlled. Energy saving becomes an important problem for every enterprise. Compared with other thermal insulation furnace lining materials like the traditional thermal insulation fire bricks and the castables, ceramic fibre linings can save 10-30% energy. So it has been intensively used in many industrial fields. Its prospects are very promising.