How to apply fireproof sealant to cable trays

Fireproof sealants are used to prevent fire and smoke propagation through cable trays, maintain cable functionality during fire, and ensure compliance with safety standards. Key Applications1. Fire Containment in Cable Trays and Shafts Fireproof sealants are applied around cable trays, busways, and bunched cables where they pass through walls, floors, or ceilings to prevent the spread of fire and smoke between compartments.

This is critical in electrical shafts, industrial plants, hospitals, airports, and high-rise buildings. Sealants are often combined with fire-resistant backing plates or mineral wool to ensure a tight, reliable seal. 2.

Protection of Bundled or Grouped Cables Sealants like SikaSeal®-641 are designed for grouped or bundled cables, providing a protective coating that maintains cable integrity during fire events. The effectiveness depends on proper film thickness and coverage, ensuring that cables remain functional for power and communication even under fire conditions. 3.

Penetration Sealing Fireproof sealants are used to seal penetrations around metallic or plastic pipes and cable trays, preventing flames and smoke from passing through openings. Pressure-exerting sealants expand when exposed to heat, filling gaps and exerting pressure to maintain a fire-resistant barrier. This is particularly useful for small bore pipes and partial penetrations where collars or wraps cannot be installed.

4. Environmental and Chemical Resistance Many fireproof sealants also provide resistance to environmental factors such as moisture, dust, UV radiation, salt water, and chemicals. This makes them suitable for both indoor and outdoor applications, including offshore facilities and power stations.

5. Compliance with Fire Safety Standards Sealants are tested according to international standards such as IEC 60332 and IEC 60331, ensuring they meet fire resistance requirements for cable coatings and penetration seals. Proper installation according to method statements and site-specific conditions is essential for achieving certified fire protection performance.

Installation Considerations

Surface Preparation: Clean cables of dust, grease, or oil before application. Application: Apply sealant to achieve recommended thickness; for grouped cables, allow extra material for curved surfaces. Sealing Gaps: Ensure all gaps around cable trays and penetrations are tightly filled, with no visible cracks or voids.

Support Materials: Use fire-resistant backing plates or mineral wool for large openings. Maintenance: Sealants should be inspected periodically to ensure integrity and compliance with fire safety regulations. Fireproof sealants for cable trays are therefore essential for preventing fire spread, protecting critical electrical systems, and ensuring safety in both commercial and industrial environments.

They are widely used in high-risk areas such as nuclear facilities, substations, hospitals, and high-rise buildings.