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Application & Advantages of Magnesium Oxide in Cables | Fireproof Insulation Material

Magnesium Oxide (MgO) is a core inorganic insulating material for mineral insulated (MI) fireproof cables and an essential raw material for high-end safety cable manufacturing. It is widely applied in special cables for construction, fire protection, nuclear power, chemical industry and other harsh and high-standard scenarios.

Compared with traditional organic insulating materials, cable-grade Magnesium Oxide delivers outstanding high-temperature resistance. It can work stably at a long-term temperature of 250℃ and withstand extreme high temperatures above 1000℃ in fire conditions without melting, aging or cracking, ensuring continuous and safe cable operation.

With ultra-high insulation resistivity, MgO effectively isolates copper conductors from metal sheaths, preventing electric leakage and short circuit risks. As a halogen-free, non-toxic and low-smoke material, it produces no harmful gas during combustion, fully meeting global environmental and fire safety standards for high-end cables.

In addition, its excellent thermal conductivity quickly dissipates heat generated during cable operation, reducing overload loss and extending cable service life. Featuring stable physical and chemical properties, superior insulation and flame retardancy, magnesium oxide has become a standard insulating medium for high-quality fireproof cables and mineral insulated cables, serving as a vital basic material for modern safe power transmission systems worldwide.