Magnesium hydroxide, as an environmentally friendly inorganic flame retardant, its flame-retardant effect primarily originates from its unique physical and chemical properties.

Magnesium hydroxide can decompose rapidly under high temperatures, absorbing a large amount of heat and significantly lowering the temperature in the combustion area. This, in turn, slows down the pyrolysis rate of combustible materials, achieving the purpose of flame retardancy. This heat-absorbing decomposition process not only reduces the generation of flammable gases but also lowers flame temperature, inhibiting the spread of the fire.

The magnesium oxide (MgO) produced by decomposition forms a dense protective layer on the material's surface, effectively blocking oxygen and preventing the progression of the combustion chain reaction. Additionally, the MgO layer reflects heat, further reducing the internal temperature of the material.

Magnesium hydroxide's flame-retardant properties are further demonstrated by its non-production of toxic and harmful gases, such as hydrogen halides, meeting modern environmental protection standards. In summary, magnesium hydroxide effectively achieves flame retardancy of materials through multiple mechanisms, including heat absorption and temperature reduction, oxygen isolation, and environmental friendliness.