At present, phenolic laminate products, mica products and ceramic products are commonly used as insulation products for metallurgical electric furnace. The temperature resistance of phenolic laminate is poor, and the working temperature is only 150 ℃; Although the mica products have good temperature resistance and the working temperature can reach 600 ℃, the overall rigidity is poor and easy to be layered; Ceramic products are brittle and easy to crack.

     Insulating sleeve, with high heat resistance, high insulation and good mechanical strength. The high temperature resistant insulating sleeve comprises a round tube, which is a cylinder made of multi-layer alkali free glass fiber cloth, and the silicone adhesive layer is between the glass fiber cloth. This kind of high temperature resistant insulating sleeve has good strength and rigidity because it uses glass fiber cloth as the framework. The glass itself has good heat resistance and insulation performance. The glass fiber cloth is bonded with silicone glue, and the gap between the glass fiber cloth and the glass fiber cloth is filled with organic silica gel. It has good insulation performance, and can withstand high temperature of 500 ℃. The power frequency dielectric strength can reach 20kV / mm, And the mechanical strength is good.

      The high temperature resistant insulating sleeve comprises a round tube, which is a cylinder made of multi-layer alkali free glass fiber cloth, and a silicone adhesive layer between the glass fiber cloth. One end of the round pipe of the high temperature resistant insulating sleeve can also be provided with a flange plate. The flange plate is overlapped by multi-layer alkali free glass fiber cloth, and the silicone adhesive layer is between the glass fiber cloth. It becomes a kind of single flange casing. The other end of the round pipe of the high temperature resistant insulating sleeve can also be provided with a flange plate. The flange plate is overlapped by multi-layer alkali free glass fiber cloth, and the silicone adhesive layer is between the glass fiber cloth.