Fireproof sealant for cable tray sealing

Fireproof sealants and systems for cable trays include intumescent pillows, acrylic sealants, coatings, and modular sealing systems, all designed to prevent fire and smoke spread while maintaining cable functionality.

Intumescent Pillows

AF BAGS are intumescent and ablative fireproof pillows certified under EN 1366-3 for up to EI 240 fire resistance. They consist of a non-combustible fiberglass casing filled with intumescent compounds, thermal insulators, and water-release products. These pillows can be inserted directly into cable tray penetrations, even in thin structures, without requiring a frame around the perimeter. They are suitable for cables up to 21 mm in diameter and allow easy repositioning for maintenance or modifications .

Fireproof Coatings and Tapes

Products like FLAMMOTECT-A and DG-CR 0.7 provide a protective coating or tape around cables inside trays. These solutions prevent flame propagation, maintain cable functionality during a fire, and protect against environmental factors such as UV, moisture, and chemicals. They are suitable for indoor and outdoor applications, including industrial, hospital, and offshore facilities .

Intumescent Acrylic Sealants

FireStop Intumescent Acrylic Graphite 682 is an acrylic-based sealant that expands when exposed to heat (starting at +200°C), effectively blocking smoke and fire. It is ideal for sealing cable penetrations before finishing works and can be used in combination with fire-rated PU foam for enhanced protection .

Modular Sealing Systems

Systems like CSD Sealing Systems and KBS offer modular solutions for multi-cable or cable tray penetrations. These systems use expanding rubber inserts, sealants, or mortars to create fire, gas, and water-tight seals. They are designed for easy installation around existing cables and can adapt to different diameters and penetration types. KBS solutions, for example, ensure that steel tube temperatures do not exceed 180 K within 90 minutes of fire exposure, complying with EN 1366-3 standards .

Installation Considerations

• Measure the cable tray dimensions and select the appropriate size and number of pillows or sealant volume.
• Ensure the sealing depth meets the certified fire rating (e.g., 120 mm for AF BAGS).
• For coatings or tapes, apply evenly around all cables to maintain continuous protection.
• Modular systems should be assembled around the cable run and secured to the wall or floor as per manufacturer instructions.
• Always verify that the chosen solution is compatible with the cable type, tray material, and fire rating requirements.

Summary

For sealing inside cable trays, intumescent pillows are ideal for quick, repositionable solutions, acrylic sealants provide flexible fireproofing for joints, coatings and tapes protect individual cables, and modular systems offer robust, multi-cable penetration protection. Selecting the right solution depends on cable diameter, tray configuration, fire rating requirements, and maintenance needs.