Cable trays require inorganic fireproof sealing

Inorganic fireproof sealing materials, such as expansion-type modules and mineral-based mortars, provide reliable fire protection for cable trays by preventing flame and smoke propagation while maintaining circuit integrity.

Overview

Inorganic fireproof sealing materials are designed to protect cables and cable trays from fire, ensuring continued operation or controlled shutdown of critical systems. These materials are typically noncombustible, environmentally friendly, and resistant to high temperatures, making them suitable for industrial, petrochemical, power, and communication facilities . They are often used in combination with intumescent coatings or mineral fiber boards to enhance fire resistance.

Key Types and Products

1. Expansion-Type Flame Retardant Modules
   • Example: DM-A3-HJ-I modules are made from expanded vermiculite and other fire-resistant inorganic materials.
   • Features: Rectangular interlocking design, easy to cut and drill, suitable for sealing cable trays and holes.
   • Environmental benefits: Non-toxic, pollution-free, and installed without adhesives like formaldehyde .
2. Mineral Fiber and Mortar Systems
   • Example: KBS® Mortar and Foamcoat HS consist of mineral fiber boards, ablative coatings, and joint sealants.
   • Fire resistance: Single-panel penetration seals up to EI60, double-panel up to EI120.
   • Applications: Sealing complex cable systems, individual cables, and electrical installation pipes in walls and floors .
3. Flexible Fireproof Wraps
   • Example: FyreWrap® Cable Insulation uses Insulfrax® thermal insulation encapsulated in aluminum foil and fiberglass scrim.
   • Benefits: Maintains electrical circuit integrity during hydrocarbon fires, suitable for trays with zero to full cable loading, FM Global approved, and compliant with ASTM E-1725 and E-1529 .
4. Pressure-Exerting Sealants
   • Example: Pyroplex Pressure Exerting Sealant expands when exposed to heat, sealing gaps around cable trays and small pipes.
   • Fire resistance: Up to 240 minutes, halogen-free, odorless, and adheres well to common building materials.
   • Ideal for internal use around bunched cables and metallic or small plastic pipes .

Advantages of Inorganic Fireproof Materials

• High-temperature resistance: Noncombustible and capable of withstanding extreme heat.
• Environmental safety: Many products are free from toxic adhesives and halogens.
• Durability: Resistant to moisture, dust, UV radiation, and chemicals.
• Ease of installation: Modular designs or flexible wraps allow quick retrofitting and maintenance.
• Compliance: Tested to international standards such as DIN 4102-9, EN 1366-3, BS 476 Part 20, and UL 1479 .

Applications

• Industrial plants, power stations, and substations
• Petrochemical and chemical processing facilities
• Hospitals, airports, and public infrastructure
• Offshore platforms and sensitive installations requiring high fire safety standards

Installation Considerations

• Ensure surfaces are clean, dry, and structurally sound.
• Use interlocking modules or backing materials as required.
• Apply sealants or wraps according to manufacturer specifications to maintain fire rating.
• Regular inspection and maintenance are recommended, especially in retrofitted or frequently modified cable trays. In summary, inorganic fireproof sealing materials provide robust, environmentally safe, and high-performance fire protection for cable trays, ensuring both safety and operational continuity in critical installations. Products like expansion-type modules, mineral fiber mortars, flexible wraps, and pressure-exerting sealants offer versatile solutions for a wide range of industrial and commercial applications.