detail intruduction 　　
   Polycrystalline alumina fiber cotton is prepared by the sol-gel method, which has the advantages of small bulk density, low thermal conductivity, good thermal shock stability, high service temperature, good chemical stability, and good corrosion resistance. It is widely used in the fields of metallurgy, building materials, ceramics, aerospace and military industry.
   Product specification

　Application:
　　
　　1. Made into fiber insulating felt/board or special shaped fiber products used in furnaces with service temperature above 1 400 ℃
　　
　　2. Filling materials in expansion joints or short-term insulating patch
　　
　　3.Reinforcing materials of piston, brake block or other alloy composites
　　
　　4.Heat insulating layer of rocket motor or other insulating materials in aerospace industry.