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Smoke and exhaust prevention duct is an important component of building smoke prevention and exhaust system. In the event of a fire, the smoke prevention duct delivers and replenishes pressurized air to maintain the escape passageway and space from the intrusion of smoke; The duct shall timely remove a large amount of smoke generated by the fire to facilitate the transfer and evacuation of personnel. The common practice is to wrap the galvanized steel duct with thermal insulation material to ensure that the duct can maintain effective operation for a certain period of time in the event of a fire.
glass wool is a common thermal insulation material, widely used in building insulation and thermal insulation. Can fiberglass wool be used for stopping smoke and exhaust spread? This article will elaborate from the following two aspects.
1. High temperature resistance of fiberglass wool
Ordinary glass wool products can be used when the operating temperature is not higher than 250 &#;. High temperature fiberglass wool products can be used under high temperature conditions (hot surface temperature greater than 250 &#;). The maximum use temperature of Huali glass wool is between 300 and 500 degrees Celsius.
glass wool is a product made by processing molten glass fiber with a thermosetting resin based adhesive, and its main component is glass fiber. glass fiber itself is non combustible and has a certain degree of heat resistance. However, fiberglass wool products made from glass fibers must be added with resin based adhesives to bond the fiberglass fibers and maintain structural support. When encountering high temperatures (usually at 200 to 300 degrees Celsius), the resin binder will carbonize and melt, and the fiberglass wool will lose its structural support. This is the key factor why the fiberglass wool cannot withstand high temperatures above 500 degrees Celsius.
2.Melting point of glass wool
Generally, the melting point of fiberglass wool is about 565 degrees Celsius, which is fitted by the following fire standard temperature rise curve: When a fire occurs for about 6 minutes, the fiberglass wool melts. When the insulation material melts, its structure, size, color, and so on undergo significant changes. Its physical properties, such as thermal conductivity and thermal resistance, can undergo sudden changes.
Further oven heating tests on fiberglass wool showed that when exposed to high temperatures exceeding 650 &#;, the fiberglass wool would significantly shrink. When the temperature rose to 850 &#;, its volume decreased by 96%, and its structural integrity was completely lost. Once integrity is lost, its insulation ceases to exist.
Therefore, changes in glass wool at high temperatures indicate that glass wool does not contribute to providing additional fire protection for buildings. It is obviously inappropriate to use fiberglass wool as a building fireproof material, especially for smoke exhaust ducts. Compared to fiberglass wool, rock wool is more suitable for providing fire protection for buildings. The raw material of rock wool is basalt, and its use temperature will be higher.
BONDED FIBRE GLASS WOOL CONFIRMS TO IS
Made from bonded glass fibres. For thermal and acoustic insulation, available with or without AI.foil. Idea for under deck Insulation, over the false ceiling and for Ducting.
Size: Rolls in standard width of 1.2 m
Contact us to discuss your requirements of glass wool with aluminium foil. Our experienced sales team can help you identify the options that best suit your needs.
Density: 16, 24, 32 & 48Kg/m3
Thickness : 25, 50mm Aslo R.P.Tissue and Rigid Boards etc.,
Glass wool Insulation is one of the most widely used forms of insulations world-wide because of its thermal and acoustic properties, light weight, high tensile strength and exceptional resilience. Glass wool is one of the most dominant types of insulations preferred in applications with service temperatures ranging upto 250C.
Glass wool consist of fine, long, inorganic fibers bonded together by high temperature binder. These fibers (each of approx. 6 - 7 microns diameter) are distributed to trap millions of tiny pockets of air in it thereby creating it an excellent thermal and acoustic insulation. The light weight of Glass wool also offers significant advantages during transport and installation. In addition, Glass wool is chemically inert and has no impurities such as iron shots, sulphur and chloride. The product is non corrosive to metal and does not support mold grow. It is manufactured from renewable raw materials and is environmental friendly in every stage.
Glass wool is formed into products with various thickness and densities. It comes in the form of rolls and slabs with or without Aluminum foil Paper.
Types of facings: Aluminum Foil, Black Glass Tissue, Glass Cloth.
Product Range: Density 12 Kg/Cubic m to 100 Kg/Cubic m and thickness 12mm to 100mm
Temperature Range: Glass wool is suitable for applications ranging from minus 195 degree Celsius to plus 230 degree Celsius. For special applications up to 450 degree. Aluminum foil facing is suitable up to 120 degree Celsius.
Chemical Stability: Glass wool is chemically inert. Application does not cause or accelerate corrosion. Glass wool is rot proof and odorless.
Fire Safety: Glass wool is non-combustible in accordance with BS 476 incombustible, extremely low spread of flame, non emission of dense smoke and toxic gases, on depletion of oxygen (high oxygen index 70%).
Biological: Glass wool is inorganic. Does not encourage growth of fungi and vermin.
Dimensional: Glass wool is stable under varying conditions of temperature and humidity when applied correctly. Excellent tear strength and not prone to sagging or settling. Rigid slabs have inherently high compression resistance.
Vibration and Jolting Resistance: Conforms to BS .
Moisture Content: Less than 2% in accordance with BS .
Water Absorption: Less than 2% in accordance with BS .
Shot Content: Nil in accordance with BS .
Odorless: Conforms to BS .
No Mould Growth: Conforms to BS .
Recovery after Compression: More than 95% in accordance BS
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