Fireproof cable trays made of magnesium oxide composite material

Magnesium oxide (MgO) provides exceptional fireproofing and insulation for cable trays, ensuring circuit integrity and safety in extreme conditions.

Construction and Materials

Fireproof cable trays using magnesium oxide typically employ mineral insulated (MI) cables, where copper or stainless steel conductors are surrounded by magnesium oxide insulation and enclosed in a metal sheath such as copper or aluminum.

The Mg

O fills the space between the conductor and the sheath, providing mechanical stability, electrical insulation, and fire resistance. Some systems also use mica tape with metal cladding or low-smoke halogen-free jackets for additional protection in exposed installations.

Fire Resistance and Safety

Magnesium oxide has a very high melting point (~2,852°C) and is non-combustible, allowing cables and trays to maintain operation during fires.

M

I cables can operate normally at 250°C and maintain circuit integrity for up to 30 minutes at 1,000°C, ensuring critical systems remain functional during emergencies.

Mg

O insulation does not produce toxic smoke or gases, making it safe for confined or hazardous environments. ApplicationsMgO-insulated fireproof cable trays are widely used in: High-rise buildings, airports, and tunnels for life-safety systems Industrial plants, chemical processing, and offshore oil rigs where fire, moisture, and chemical resistance are critical Nuclear power stations and substations requiring long-term durability and corrosion resistance Aerospace and defense systems for extreme temperature and radiation-resistant applications AdvantagesThermal stability: Maintains performance under extreme heat Electrical insulation: High dielectric strength prevents leakage and ensures system stability Chemical and moisture resistance: Suitable for wet or corrosive environments Long lifespan: Can last 30 years or more with proper installation Mechanical strength: MgO enhances cable flexibility and resistance to wear and pressure Additional Fireproofing OptionsSome systems, like Unifrax FyreWrap®, provide flexible insulation wraps around cable trays using magnesia-based thermal insulation, encapsulated in aluminum foil and fiberglass scrim for added fire and moisture protection.

Other coatings and tapes, such as FLAMMOTECT-A and DG-CR 0. 7, can be applied to cable trays to prevent flame propagation and enhance environmental resistance.

Summary

Fireproof cable trays made with magnesium oxide offer superior fire resistance, electrical insulation, and durability compared to traditional organic insulation. They are ideal for critical infrastructure, industrial, and high-risk environments, ensuring circuit integrity, safety, and long-term reliability even under extreme heat, chemical exposure, or mechanical stress.