The improvement of the burning grade of the external wall insulation material causes the discussion of the central air-conditioning duct insulation material. Is it necessary to raise the flame-retardant B1 grade to the non-combustible grade A, and there is no A-grade fireproof insulation material suitable for the central air-conditioning duct, the author from the following Analyze in several ways. The improvement of the burning grade of the external wall insulation material causes the discussion of the central air-conditioning duct insulation material. Is it necessary to raise the flame-retardant B1 grade to the non-combustible grade A, and there is no A-grade fireproof insulation material suitable for the central air-conditioning duct, the author from the following Analyze in several ways.
The flame retardant B1 insulation board will not be burned. The central composite air conditioning ducts currently using insulation materials on the market are:
1. The glass-magnesium composite plate duct is made of flame retardant B1 grade polystyrene foam board, and the composite glass fiber reinforced magnesium oxychloride cement on both sides of the foam board.
Second, polyurethane aluminum foil composite air duct, using flame retardant B1 grade polyurethane foam board insulation, foam board on both sides of composite aluminum foil.
3. The phenolic aluminum foil composite air duct is made of flame retardant B1 phenolic foam board and composite aluminum foil on both sides of the foam board.
Fourth, color steel plate insulation composite duct, using flame retardant B1 grade polystyrene, polyurethane or phenolic foam board, foam board on both sides of composite color steel plate.
By analyzing the test data, the following information is obtained:
1. The material properties of organic foam ventilation ducts cannot reach Class A.
Second, glass wool composite duct Although inorganic foam as the main material, but to meet the strength requirements of the duct, it is necessary to increase the amount of adhesive, the increase of organic binder affects the heat value and toxicity of glass wool. Therefore, the samples in this test failed to meet the Class A requirements.
Third, the mechanism of the glass magnesium composite panel air duct overall fire performance is very good, the results fully meet the A-level requirements. Although the composite duct is also made of polystyrene foam as the heat insulating core material, the foam is not directly exposed to the flame. Although the heat value of the foam board is 30 MJ/kg, the thermal value of the magnesium cement on both sides of the foam board is small, only 1.8. MJ/kg, the mechanism of the glass-magnesium composite plate duct fully meets the requirements of Grade A (composite sandwich) material in GB8624-1997 "Combustion Performance Classification of Building Materials and Products".
According to the analysis of the test results of the composite duct burning performance by the Sichuan Fire Research Institute of the Ministry of Public Security, except for the mechanism of the glass-magnesium composite panel duct, which is non-combustible grade A, the polyurethane composite duct, the phenolic composite duct, and the polystyrene composite duct are all flame retardant. B1 level. The flame-retardant B1 foam board is affected by the halogen element flame retardant. From the combustion index and phenomenon analysis, the foam board burns under the action of fire, self-extinguishing from the fire, and the foam board itself does not prolong combustion, which can prevent the spread of fire. .
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