Builders use fire-resistant cotton to fill gaps in steel structures, significantly improving fire resistance.
Apr 11,2025
Building Fire Resistance
Secondary fire-resistant steel columns originally required 2 hours; using pre-oxidized fiber fire-resistant cotton can achieve 2.5 hours (primary fire resistance requirement).
After filling the gaps in the joints, the steel beam deformation was reduced by 82%, and the fire resistance integrity was improved.
Material Performance Advantages
High-temperature resistance: The limiting oxygen index of pre-oxidized fiber is ≥45%; it does not melt at 600℃, directly blocking the spread of fire through gaps.
Lightweight: Density is only 1.4g/cm³, 36% lighter than traditional fire-resistant coatings (2.2g/cm³), reducing structural load.
Self-extinguishing: Self-extinguishing within 0.5 seconds of leaving the fire source, avoiding the risk of secondary ignition.
Construction Economy
A single filling thickness of 3-5mm can meet the 2-hour fire resistance requirement. Compared with water-based coatings that require 4-5 coats of brushing (total thickness 2.5mm), labor time is reduced by 60%.
High-rise Buildings
Filling pre-oxidized fiber fire-resistant cotton in the steel structure joints of the core tube of super-high-rise buildings improves the fire resistance limit of the floor.
Reduces the cracking and shedding problems common with traditional fire-resistant coatings. The flexible filling of pre-oxidized fiber fire-resistant cotton expands and contracts with the steel structure, reducing maintenance costs.
Industrial Plants
After filling the gaps in the steel trusses of petrochemical plants, the fire resistance limit is effectively improved.
Historical Building Renovation
In the reinforcement of steel and wood structures in historical buildings, the concealed filling of pre-oxidized fiber fire-resistant cotton achieves fire protection upgrades without damaging the appearance. It also reduces the problem of exceeding the self-weight.
Pre-oxidized fiber fire-resistant cotton has excellent properties of flame retardancy, fire resistance, high-temperature resistance, and a high limiting oxygen index. In the event of open flames, it carbonizes at the point of contact, does not spread the fire, does not drip, and does not melt; it self-extinguishes when removed from the flame and does not reignite.
The overall texture is skin-friendly, soft, easy to cut, easy to fold, not prickly, and has good spinnability.
Resistant to chemical corrosion, acids, and alkalis.
Environmentally friendly material, does not release toxic gases after combustion, and is biodegradable.
Water repellency reaches 98%.
In addition to various thicknesses of conventional fire-resistant cotton, Kaidun produces and sells pre-oxidized fiber fire-resistant cotton, including composite aluminum foil fire-resistant cotton (incense burner pad), composite adhesive-backed fire-resistant cotton (adhesive-backed strip), and composite silicone fire-resistant cotton. In addition to fire-resistant cotton felt products, there are also pre-oxidized fiber fire-resistant fabrics, which are woven fabrics, such as pre-oxidized fiber aramid blended woven fabrics and pre-oxidized fiber acrylic blended woven fabrics.
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