Exterior Expansive Steel Structure Fire Retardant Paint

Outdoor expansive type fire-resistant steel structural coatings refer to fire-resistant coatings with a thickness greater than 7 mm and less than or equal to 45 mm, featuring a granular surface, lower density, and low thermal conductivity. These coatings have a fire resistance limit of over 2 hours. Due to the predominant inorganic materials in thick fire-resistant coatings, their fire-resistant performance is stable and their long-term use effectiveness is good. However, the larger particles in the coating composition result in an uneven surface finish, affecting the overall aesthetics of the building, and thus, they are mostly used in concealed structural engineering. In fires, these coatings utilize the granular surface of the material, lower density, low thermal conductivity, or the material's heat absorption, to delay the temperature rise of the steel and protect it.

This type of fire-resistant paint is made by mixing appropriate inorganic binder materials (such as water glass, silicon sol, aluminum phosphate salts, refractory cement, etc.) with inorganic lightweight insulating aggregates (like expanded perlite, expanded vermiculite, sea spathic, float glass, fly ash, etc.), fire-retardant additives, chemical agents, reinforcing materials (such as aluminum silicate fibers, rock wool, ceramic fibers, glass fibers, etc.), and fillers, offering the advantage of lower cost.

Construction commonly employs spraying, suitable for concealed steel structures indoors and outdoors with fire resistance requirements of 2 hours or more, high-rise full steel structures, and multi-story factory steel structures. For example: the fire resistance of columns in high-rise civil buildings and the columns supporting multi-stories in general industrial and civil buildings should all reach 3 hours, requiring the use of this thick-type fire-resistant paint for protection.