How to choose the fireproof coating for steel structure correctly?

1. It is not advisable to use intumescent fire retardant coatings outdoors: Intumescent fire retardant coatings were originally used for wooden structures, due to poor weather resistance, easy aging, peeling, reliability problems of expansion in humid and corrosive environments, and high temperature flames. In the process of grilling and foaming, the resin decomposes to produce thick smoke and toxic gases. Therefore, without special measures, it is not suitable to use intumescent fire retardant coatings in tunnels, outdoors and buildings where people often stay. The projects in the nuclear energy, electric power, petrochemical and chemical industries should be mainly based on thick fire retardant coatings. 2. Carefully select thin-coated steel structure fireproof coatings, and strictly control the selection of ultra-thin steel structure fireproof coatings: It is necessary to strictly control all steel structure buildings, especially steel columns, steel beams, steel floors and steel evacuation stairs in large public buildings. Application in civil construction. Steel columns, steel floor slabs, steel evacuation stairs and other main building components should be given priority to use fire protection materials such as steel mesh concrete. If it is really difficult, thick steel structure fireproof coatings can be used for protection, and thin steel structure fireproof coatings are carefully selected and strictly controlled. Selection of ultra-thin steel structure fireproof coatings. High-rise building steel structures and multi-storey steel structure workshops should not use thin-coated and ultra-thin steel structure fireproof coatings. 3. Choose fire retardant coatings according to the requirements of building parts and fire resistance rating: For hidden steel structures in buildings, the appearance quality of the coating is not high, and thick steel structure fire retardant coatings should be used as much as possible. For exposed steel grids, steel roof trusses and roof load-bearing structures, when the fire resistance limit specified in the code is less than 1.5h, thin-coated or ultra-thin steel structure fireproof coatings can be used. When the fire resistance limit exceeds 2.0h, thicker coatings should be used. Fire retardant coating for steel structure. Reminder: The hidden steel structure in the building does not have high requirements on the appearance quality of the coating, so thick-shaped steel structure fireproof coating should be used as much as possible. For exposed steel grids, steel roof trusses and roof load-bearing structures, when the fire resistance limit specified in the code is less than 1.5h, thin-coated or ultra-thin steel structure fireproof coatings can be used. When the fire resistance limit exceeds 2.0h, thicker coatings should be used. Fire retardant coating for steel structure.