Magnesium hydroxide is an inorganic flame retardant with the chemical formula Mg(OH)2, white amorphous powder or colorless hexagonal crystal, almost insoluble in water. Its thermal stability is up to more than 340°C, and it can be applied to the flame retardant filling of engineering plastics. Aluminum hydroxide is referred to as ATH, which has the functions of flame retardant, smoke suppression, filling, etc., and is a safe and non-toxic flame retardant. Aluminum hydroxide is above 180 °C and reduces the temperature of the polymer through the dehydration and endothermic process, which has the effect of flame retardant. Magnesium hydroxide and aluminum hydroxide are both inorganic substances that have the property of reacting with acids to form salt and water, and can also react with strong bases to form salt and water, so they are both amphoteric hydroxides. However, there are some differences between them in terms of physical and chemical properties.

Aluminum hydroxide is a white, amorphous powder that reacts with acids to form salts and water, and with strong bases to produce salts and water. Because it is acidic, it can also be called aluminic acid. In medicine, aluminum hydroxide can be used as an antacid to treat excessive stomach acidity.

Magnesium hydroxide is a white, amorphous powder that can also react with acids and strong bases to form corresponding salts and water. Because its melting point is higher than that of aluminum hydroxide, it can better play its excellent flame retardant, smoke suppression and filling functions at high temperatures. In addition, magnesium hydroxide has a high decomposition temperature, which makes it stable at high temperatures.

In summary, magnesium hydroxide and aluminum hydroxide are amphoteric hydroxides, but differ in physical properties (e.g., melting point) and specific uses (e.g., as flame retardants).

Magnesium hydroxide flame retardant and aluminum hydroxide flame retardant have their own advantages and application scenarios.

Magnesium hydroxide flame retardant has a high melting point, high decomposition temperature and good thermal stability, so it can maintain excellent flame retardant, smoke suppression and filling effects at high temperatures. In addition, magnesium hydroxide has a high decomposition temperature and is able to maintain stability at high temperatures.

Aluminum hydroxide flame retardant has the advantages of outstanding endothermic cooling effect in the reaction process, environmental protection and safety, reinforcing effect on rubber and other products, and sufficient resources. In addition, surface-modified ultra-fine aluminum hydroxide can also improve the mechanical properties of the material.

Therefore, when choosing magnesium hydroxide flame retardant or aluminum hydroxide flame retardant, it is necessary to consider comprehensively according to the specific application scenarios and needs. In high-temperature environments, magnesium hydroxide flame retardants may be more suitable, while aluminum hydroxide flame retardants may be more suitable when environmental protection and mechanical properties are required.

Hongtaiji has been professional in flame retardant for 20 years, and its products meet international environmental protection requirements: (1) EU ROHS directive (2) REACH regulatory standards. Obtained ISO9001:2015, ISO14001:2015, ISO45001:2018 management system certification. Independent research and development of melamine cyanurate (MCA), microencapsulated red phosphorus, melamine pyrophosphate (MPP), polyolefin halogen-free flame retardant, acid fire retardant coating, acrylic flame retardant, and other environmentally friendly flame retardants.