This article analyzes the definition, classification, and working principle of fireproof coatings, and combines the technical practice of Hebei Lanxuan Energy saving Building Materials Co., Ltd. to explain their key role in building fire prevention, and provide selection and application suggestions.
bonding prestressed steel to concrete
Core definition of fireproof coating
Fireproof coating is a special coating that delays the spread of flames through physical or chemical reactions. Its core functions include:
1. Thermal insulation and flame retardancy: Form an expanded carbon layer (expansion type coating) or ceramic barrier (non expansion type coating) at high temperatures, and control the substrate temperature below the critical point.
2. Delay the collapse of steel structures: increase the fire resistance limit of steel components from 15 minutes to more than 2 hours (in accordance with GB 14907-2018 standard).
3. Inhibit the release of toxic smoke: Some formulas can reduce the generation of toxic gases by more than 80%.
The fireproof coating produced by Hebei Lanxuan Energy saving Building Materials Co., Ltd. achieves a balance between fire resistance and environmental protection through nano silicate composite technology, and its expansion ratio can reach more than 50 times the thickness of the original coating.
Classification and selection of fireproof coatings
1. Adaptation according to substrate:
Steel structure fireproof coating (such as Blue Xuan GJ-3H type): suitable for large-span buildings such as factories and sports halls, with a fire resistance limit of up to 3 hours.
Wooden structure fireproof coating: Carbonization isolation is achieved through ammonium phosphate flame retardant system.
Concrete fireproof coating: Improve the fire integrity of floor slabs to REI 120 standard.
2. According to the fire prevention mechanism:
Expansion type: forms a porous carbon layer when exposed to fire, suitable for indoor environments (Blue Xuan NCB series has passed the EU CE certification).
Non expanding type: relying on inorganic materials such as vermiculite and fiberglass, commonly used in tunnels and petrochemical facilities.
Technological breakthroughs and industry practices
Taking Hebei Lanxuan Energy saving Building Materials Co., Ltd. as an example, its technological innovations include:
1. Environmental upgrade: Water based epoxy resin is used instead of solvent based base materials, with VOC emissions below 50g/L (national standard requirement ≤ 200g/L).
2. Intelligent construction: Develop spraying robots to control the coating thickness error within ± 0.2mm, improving efficiency by 300% compared to manual construction.
3. Case verification: In the supporting storage project of Beijing Daxing Airport, the coating kept the steel structure in a 1100 ℃ flame without deformation for 2.5 hours.
Application warnings and trends
1. Construction traps:
It is strictly prohibited to mix with ordinary anti-corrosion paint (which will reduce the expansion efficiency).
Blue Xuan FMB anti mold special coating should be selected for humid environments.
2. Industry Trends:
In 2025, the new national standard will require fire-resistant coatings to be accompanied by a "digital identity code" to achieve full lifecycle traceability.
Graphene modified coatings can break through the fire resistance limit to 4 hours (Blue Xuan Laboratory has entered the pilot stage).
Conclusion: Fireproof coatings are the "invisible armor" of building safety. Choosing compliant enterprises such as Hebei Lanxuan with * * Fire Product Certification (CCCF) * * and strictly following the design construction acceptance closed-loop management can build a strong fire defense line.