GT-NSF3.0 thick steel structure Fire retardant coating Thickness requirements
GT-NSF3.0 thick steel structure fire protection coating The thickness is in accordance with the requirements of GB149070-2018 fire retardant coating specification. The coating thickness needs to be more than 15mm. The fire resistance of this product is limited to 3.0h. It can be used for fire protection of ordinary steel structures, indoor plants, warehouses, production workshops and multi-storey buildings, and can be used for Class I fire protection as required by the building fire protection design code.
Fire and heat insulation principle of non expansive fire retardant coating:
Coated on steel members Non expansive fireproof coating The principle of fire protection and heat insulation is that the volume of the coating basically does not change when the fireproof coating is exposed to fire, but the thermal conductivity of the coating is very low, which delays the speed of heat transfer to the protected base material. The coating of the fireproof coating itself is incombustible, acts as a barrier and prevents thermal radiation on the steel members, and avoids the direct attack of flame and temperature on the steel members . In addition, some components in the coating react with each other when encountering fire to generate incombustible gas, which is an endothermic reaction and also consumes a lot of heat, which is conducive to reducing the system temperature, so the fire prevention effect is significant, and it can provide fire and heat insulation protection for steel . In addition, this kind of fireproof coating for steel structure changes to form a glaze protective layer when it is exposed to fire, which can isolate oxygen, so that oxygen can not be contacted by the combustible substrate that can not be protected, thus avoiding or reducing combustion reaction . Thick coating fire retardant coating It is a modern good heat insulation and fire retardant coating for steel structure 。
GB14907-2002.
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S/N
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project
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Technical indicators
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Measured results
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one
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stay container Status in
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No caking, stirred evenly, thick fluid
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Uniform thick fluid, no caking
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two
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Drying time (surface drying), h
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≤24
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sixteen
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three
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Initial drying crack resistance
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Generally, there should be no cracks, 1-3 cracks are allowed, and the width should be ≤ 1mm.
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No crack
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four
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Bond strength, Mpa
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≥0.04
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zero point two
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five
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Compressive strength, Mpa
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≥0.3
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zero point six
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six
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Dry density, (kg/m3)
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≤500
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four hundred and sixty-one
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seven
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Water resistance, h
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The coating shall be free of delamination, foaming and falling off for ≥ 24h.
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qualified
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eight
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Cold and hot cycle resistance (times)
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≥ 15 times of coating shall be free of cracking, peeling and blistering.
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qualified
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nine
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Fire resistance
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Coating thickness, mm
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25±2
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twenty-five
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Fire resistance limit, h
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≥2
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three
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