In smoke exhaust or high-temperature ventilation systems, duct flange ceramic fiber gaskets must be non-combustible materials. In the connection of smoke exhaust system pipes, the material of smoke exhaust duct flange gaskets is generally heat-resistant rubber sheet or 9501 rubber strip. Heat-resistant rubber sheet and 9501 rubber strip are only heat-resistant, and their temperature resistance is about 100℃. In case of fire, the air duct may contain higher temperature smoke or open flames, while heat-resistant rubber sheet and 9501 rubber strip will soften and decompose when the temperature exceeds 250℃, and will burn when encountering open flames, which will not play a sealing role in smoke and exhaust, and cannot meet the fire protection regulations. In the current construction status, the actual operation does not meet the requirements of the specifications. In order to ensure the safety of the building, this is a potential problem that cannot be ignored. It is necessary to find a flange gasket that meets the requirements of the specifications to replace the heat-resistant rubber sheet.
Ceramic fiber is made of natural kaolin after melting in an arc furnace and then sprayed or spun by resistance method. The continuous use temperature can reach 1000℃, and the short-term use temperature can reach 1260℃. The product meets the requirements of GBT16400-2003. Ceramic fiber is a fibrous lightweight refractory, heat-insulating and energy-saving material that combines the superior performance of traditional insulation materials and refractory materials. It has the characteristics of non-flammability, heat resistance, good thermal stability, light weight, significant energy-saving effect, non-toxicity, harmlessness and odorlessness.
Ceramic fiber is used as flange gasket for smoke exhaust ducts. It uses the characteristics of ceramic fiber gasket products with compression resilience, heat resistance and non-combustion. Among ceramic fiber products, ceramic fiber rope and ceramic fiber paper can be used as sealing materials. Ceramic fiber rope: It is made of high-quality ceramic fiber wire in a round weave. It is used for thermal insulation and heat insulation materials. It is an ideal substitute for asbestos rope. It is often used for high-temperature cables and pipeline wrapping. Ceramic fiber paper: Ceramic fiber paper is made of ceramic fiber spray cotton after washing and adding binder in vacuum. It has high strength, good flexibility and strong cutting properties. It is an ideal material for producing high-temperature gaskets, seals, heat insulation and insulation. It is made by gluing, cutting and packing. The commonly used thicknesses are 3mm, 4mm, 5mm, 6mm and other specifications. The width can be cut into 15mm, 20mm, 25mm, 30mm, 40mm and other sizes according to customer requirements. It has self-adhesive tape on one side and is easy to use. It can be widely used in: smoke exhaust duct flange sealing, fireproof glass sealing of fireproof windows, etc. It is the sealing gasket with the highest fireproof grade at present. It is non-flammable and will not drip, melt, shrink or deform after burning.
Technical and economic comparison:
1. Price: 9501 rubber strip: 4*10 specifications, about 80 yuan per box, the actual number of each box is about 160 meters, about 0.5 yuan/meter Ceramic fiber gasket: 3*20 specifications, about 280 yuan per box, the actual number of meters per box is 600 meters, about 0.47 yuan/meter
2. Fire resistance Heat-resistant rubber sheet and 9501 rubber strip will soften and decompose when the flue gas temperature in the air duct exceeds 250℃, and will burn when encountering open flames in the air duct. The maximum operating temperature of ceramic fiber paper is 1260℃, and it does not burn.
3. Convenience of construction Just peel off the paper film and stick it on the flange, tear it by hand, and basically there is no scrap. No large site is required for on-site storage.
