How to choose fire retardant coating for steel structure

Selection Questions:

First of all, do not use paint that has technical properties that are only suitable for indoor use outdoors.

The outdoor environment is much worse than the indoor environment. Outdoor fire retardant coatings should be water-resistant, freeze-thaw-resistant, aging-resistant, and high-strength, because outdoor fire retardant coatings must withstand wind, sun, rain, and freezing.

Second, do not use decorative fire retardant coatings to protect steel structures.

Because the thermal insulation performance of decorative fire retardant coatings generally cannot achieve the goal of significantly improving the fire resistance limit of steel structures.

In order to overcome the shortcomings of steel structure materials in fire protection in practical applications, fire protection treatment must be carried out, the purpose of which is to increase the fire resistance limit of steel structure to the limit range specified in the design specifications. There are various measures to prevent steel structure from rapidly heating up and deforming and collapsing in fire. The key is to adopt different methods according to different situations, such as using insulation and refractory materials to block the flame of transparent display screen from directly burning steel structure, reducing the speed of heat transfer to delay the time of temperature rise and strength weakening of steel structure, etc. But no matter what method is adopted, the principle is the same. The following introduces several fire protection measures for different steel structures.

It is to add an outer layer to the surface of the steel structure, which can be cast in place or sprayed. The cast-in-place solid concrete outer layer is usually reinforced with wire mesh or steel bars to limit shrinkage cracks and ensure the strength of the shell. The spraying method can apply sand pumps to the surface of the steel structure at the construction site to form a protective layer. The sand pumps can be lime cement or gypsum mortar, and can also be mixed with perlite or asbestos. At the same time, the outer layer can also be made of perlite, asbestos, gypsum or asbestos cement, light concrete to make prefabricated panels, and fixed to the steel structure with adhesives, nails, and bolts.