In the wire and cable industry, where fire safety is paramount, magnesium hydroxide flame retardants are emerging as a game - changer.
Magnesium hydroxide (Mg(OH)₂) offers a non - halogen, eco - friendly solution. Unlike traditional halogen - based retardants that release toxic gases during combustion, Mg(OH)₂ decomposes into non - harmful magnesium oxide and water vapor. This aligns with the industry’s push for Low Smoke Zero Halogen (LSZH) cables, crucial for public spaces like buildings, subways, and airports.
When exposed to fire, Mg(OH)₂ undergoes an endothermic decomposition at 340 - 450°C. The process absorbs heat, cooling the cable surface, and the water vapor dilutes oxygen, suppressing flame spread. The magnesium oxide residue then forms a protective layer, blocking further combustion.
For common cable polymers like PVC and cross - linked polyolefins, Mg(OH)₂ enhances fire resistance without compromising mechanical properties. Surface - treated grades (e.g., with silane coupling agents) ensure uniform dispersion, maintaining cable flexibility and electrical insulation. In LSZH cable production, it reduces smoke density by neutralizing acidic gases, improving visibility and safety during fires.
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