The ceramic fiber module comprises a folding block, a slicing block, a pyro block and a vacuum forming block. Due to the different fabrication methods and crystal orientation structures of polycrystalline mullite fibers, their fiber lengths are short and their softness is poor. The polycrystalline fiber cannot be used in large scale because it cannot be made into large modules. Nowadays, polycrystalline fiber is mostly used for pasting blocks on the inner surface of castable or refractory brick furnace wall and furnace top. The use of polycrystalline fiber pasting blocks can effectively reduce the temperature of furnace outer wall and reduce the heat storage loss of furnace wall. The ceramic fiber insulation block is made by pressing the ceramic fiber blanket according to the specified size with the module punching machine. After pressing, the specification size and compression ratio shall be corrected again to ensure the size and unit weight of the module.
The ceramic fiber insulation block firmly combines the module with the furnace shell steel plate through the anchor embedded in the module and the external anchor welded on the early furnace shell.

The module has good elasticity. After the installation of each module, untie the binding belt, and the module and the module extrude each other, so that the module can form a seamless whole in the expansion direction, and can compensate for the shrinkage of the fiber lining, thus improving the thermal insulation performance of the furnace lining. The overall performance is good.
Refractory ceramic fiber is a flexible and elastic material, so it is unnecessary to consider the thermal stress at high temperature. When refractory bricks and castables are used as furnace structural materials, the furnace must have a large number of rigid steel structures. However, the refractory ceramic fiber lining is easy to be fixed, which makes a major change in furnace design and construction.

The thermal conductivity of aluminum silicate fiber in high temperature zone is very small, with excellent heat insulation effect. At 1000 ℃, its thermal conductivity is only 15% of that of refractory clay brick and about 38% of that of light clay brick,
However, its thermal conductivity is closely related to temperature, bulk density, slag ball content and fiber diameter.
The thermal conductivity of aluminum silicate fiber decreases with the increase of unit weight, but the extent of its reduction gradually decreases, even when the unit weight exceeds a certain range, the thermal conductivity will not decline and will increase. At different temperatures, there is a minimum thermal conductivity and corresponding minimum unit weight. The minimum unit weight corresponding to the minimum thermal conductivity increases with temperature.