Magnesium hydroxide (Mg (OH) ₂) is an inorganic material widely used in flame retardant systems. It can absorb a large amount of heat during thermal decomposition, while releasing moisture, diluting combustible gases, and forming insulation layers. Compared to ordinary magnesium hydroxide, products treated with high purity and ultra-fine particle size exhibit superior dispersibility, filling ability, and reactivity in material applications.

The flame retardant advantages of high-purity ultrafine magnesium hydroxide include the following characteristics:

1. High thermal decomposition temperature, suitable for more high-temperature polymers

The thermal decomposition starting temperature of high-purity magnesium hydroxide is higher than 330 ° C, which is superior to aluminum hydroxide (about 220 ° C), making it widely used in material systems with higher thermal stability requirements such as polypropylene (PP), polyamide (PA), polyolefin elastomer (TPO), polycarbonate (PC), etc.

2. Heat release inhibition effect, significantly delaying combustion spread

The particle size of ultrafine magnesium hydroxide is controlled at<1 μ m, with a larger specific surface area and higher efficiency in releasing water vapor during thermal decomposition. It can absorb more combustion heat, reduce the surface temperature of the polymer, and effectively suppress flame spread.

3. Halogen free, low smoke, non-toxic, in compliance with environmental regulations

Unlike halogenated flame retardants, which release toxic and corrosive gases during combustion, high-purity magnesium hydroxide only releases water vapor during decomposition and does not produce harmful substances such as dioxins and hydrogen chloride, meeting international environmental standards such as RoHS, REACH, UL94, V-0, etc.

4. Can be used synergistically with other flame retardants to enhance overall performance

In many practical formulations, high-purity magnesium hydroxide can work synergistically with phosphorus based flame retardants, nitrogen based flame retardants, expansion type flame retardants, aluminum hydroxide, etc., to improve the flame retardant grade of materials without sacrificing mechanical properties and processing flowability.

5. Improve smoke density and carbon residue, and enhance safety level

Research has shown that the MgO protective layer formed by magnesium hydroxide after material combustion can effectively prevent oxygen diffusion, reduce smoke density, and promote the formation of dense residual carbon in the material, improving the thermal insulation performance and structural stability after combustion.

The high-purity and ultrafine magnesium hydroxide series products of Zhongmagnesium Magnesium Industry have excellent stability, dispersibility, and flame retardant synergistic performance after precise particle size control and high-temperature hydration purification process. They have been widely used in high-end industries such as cables, batteries, plastics, coatings, etc., and are an important step towards halogen-free flame retardancy, low-carbon environmental protection.