Db-a3-cd01 fire-retardant bag is a new type of fire-proof supporting refractory developed by Weicheng company according to the new national standard of gb23864-2009 (fireproof plugging material). The shape of db-a3-cd01 fire-retardant bag is like a small pillow, the outer layer is made of treated glass fiber cloth, and the interior is filled with a mixture of inorganic non combustible materials and special additives. The product is non-toxic, tasteless, corrosion-free, water-resistant, oil-resistant, Hygrothermal resistant, freeze-thaw cycle resistant and good expansion characteristics. It can be disassembled and reused at will. It can be made into various shapes of firewall and fireproof layer according to different requirements of users, and also can be used to plug holes requiring fire-proof treatment. When encountering fire, the materials in the fire-retardant package are heated and expanded to form a honeycomb block, forming a tight sealing layer to achieve fire prevention and heat insulation, and effectively control the fire within the local range. When the plugging thickness reaches 240mm, the fire resistance limit can reach more than 180min.