The refractory fiber is a fibrous refractory material, and it is a kind of high efficiency insulation material. It has the properties of general fiber, such as soft and high strength, and can be processed into various kinds of paper, ribbon, rope, felt and blanket. It also has the properties of high temperature resistance, corrosion resistance and oxidation resistance that ordinary fibers do not possess, and overcomes the brittleness of general refractories. At the same time, there is a very significant energy saving effect. As a refractory insulation material, has been widely used in metallurgical, chemical, mechanical, building materials, shipbuilding, aviation, aerospace and other industrial sectors.