The outer layer of the fire-retardant bag is made of tightly woven and durable glass fiber cloth made of bag-shaped, and the inside is filled with special fire-resistant, heat-insulating materials and intumescent materials, and the fire-retardant bag has non-combustible and fire resistance limit can reach more than 4 hours, expand and solidify at higher temperatures. It is suitable for sealing the cavities formed when cables, oil pipes, air ducts, gas pipes, metal pipes, and other penetrations pass through partition walls or compartments in electric power, telecommunications, postal services, chemical industries, industrial and mining, enterprises, and buildings.
