| abstract |
(57) [Summary] [Problem] Workability such as removal at the time of addition of a refractory filler filled in an opening of a wire / cable penetration portion and subsequent refilling is poor. In addition, there is a problem that the inside of the switchboard is soiled by the drop of the refractory filler at the time of extension. The composition of a fire-resistant sealant for preventing fire spread is based on 100 parts by weight of a liquid polymer, 5 parts by weight or more of a phosphorus-based flame retardant, 5 parts by weight or more of a polyhydric alcohol, and 10 parts by weight of an alkali silicate compound. It is composed of 200 polymerized parts, 1 to 50 parts by weight of heat-resistant fiber, and 10 to 200 parts by weight of an inorganic filler. By providing excellent fire resistance performance, it is not necessary to fill the opening with a fire resistant filler. |