Structural Steel Fire Retardant CoatingA coating applied to the surface of steel structures on buildings and structures that forms a fire-resistant and insulating protective layer, as well as improves the fire resistance limit of the steel structure.
Fire-resistant coatings for steel structures can be categorized by their application locations:
1) Indoor steel structure fire-retardant coating, suitable for the surface of steel structures in buildings or concealed engineering.
2) Outdoor steel structure fire-retardant coatings, suitable for the surface of steel structures on buildings' exteriors or open-air projects. Steel structure fire-retardant coatings can be categorized by their application thickness:
3) Ultra-thin steel structure fire-retardant coating with a film thickness of less than or equal to 3mm.
Fire-resistant coating for thin-walled steel structures, with a coating thickness greater than 3mm and less than or equal to 7mm.
5) Thick-type steel structure fire-resistant coating; coating thickness greater than 7mm and less than or equal to
Structural Steel Fire Retardant Coating Construction Quality Control
1. Paint Appearance Before Application: Condition in the Container
2. Post-construction physical and mechanical properties: drying time, appearance and color, initial drying crack resistance, bonding strength, compressive strength, dry density, etc.
Post-construction paint durability: water resistance, resistance to thermal cycling, heat resistance, humidity resistance, freeze-thaw cycle resistance, acid resistance, alkali resistance, and salt spray corrosion resistance, etc.
4. Post-construction Paint Fire Resistance: Coating Thickness and Fire Resistance Limit
Section 3: Acceptance Method for Fire-Resistant Coatings on Steel Structures
Visual Inspection Method: Check paint types, colors, and crack conditions.
2. Tool Inspection Method: Measure the coating thickness with a thickness probe or caliper, gently tap the coating with a hammer weighing 0.75-1kg to test its strength and hollowing, and check the coating's straightness with a 1-meter ruler.
FourFire-resistant coating for steel structuresAcceptance Criteria
The coating thickness must meet the design requirements; if it is below the originally specified standard, it must be greater than 85% of the original standard, and the continuous area length of the insufficient thickness should not exceed 1m, with no similar issues occurring within a 5m range.
The coating should be completely sealed, without any exposed base or missed spots.
The coating should not exhibit cracks; if there are any, their width should not exceed 1mm.
The coating should bond firmly between the coating and the steel substrate, as well as between each layer, without any hollows, peeling, or loose conditions.
5. The coating surface should be free of protuberances, and for areas with specific appearance requirements, the deviation of the busbar's straightness and circularity should not exceed 8mm.
