Aluminum-Magnesium Flame Retardant

Aluminum-Magnesium Flame Retardant

Aluminum-magnesium flame retardants are the most common inorganic flame retardants, which have the advantages of non-toxicity and good stability. Alfa Chemistry provides a series of high-quality Al-Mg flame retardants to help you make progress and breakthroughs in the research and development of flame retardant materials.

Classification and Application

Aluminum-Magnesium Flame Retardant

Aluminum flame retardant

The most commonly used in Al-based flame retardants is aluminum hydroxide (ATH). It's applicable to various polymers. A large amount of addition must be treated with silane coupling agent for surface activity to improve the processing performance and physical and mechanical properties of the product.

Aluminum-Magnesium Flame Retardant

Magnesium flame retardant

The most commonly used in Mg-based flame retardants is magnesium hydroxide (MH). It is suitable for a variety of high polymers, especially for products with high processing temperature. In addition, basic magnesium carbonate (3MgCO3·Mg(OH)2·3H2O) can also be used as a flame retardant, which has endothermic and dilution effects. Suitable for polyolefin, polyamide, ethylene propylene rubber.

Al-Mg composite flame retardant

MH has a higher decomposition temperature and less heat absorption, and its performance in inhibiting the temperature rise of the material is worse than that of ATH. However, the carbonization flame retardant effect of MH on the polymer is better than that of ATH. Therefore, the two are used in combination and complement each other, and their flame retardant effect is better.


  • Non-toxic, good stability
  • No toxic gas is produced at high temperature
  • Can reduce the amount of smoke produced when plastic is burned
  • Inexpensive and widely sourced

Flame Retardant Mechanism

On the one hand, the thermal decomposition of ATH can take away a lot of heat generated by combustion and reduce the temperature of the combustion interface. On the other hand, the decomposition products include water vapor and Al2O3 dense oxide layer, which can dilute the concentration of combustible gas and form a protective carbon layer to achieve the effects of heat insulation, oxygen insulation, and smoke suppression.

The flame retardant mechanism of MH is similar to that of ATH, but its thermal stability is relatively good, and its smoke suppression performance is better. In addition, MH can also promote the carbonization of the plastic surface.

The Al-Mg composite flame retardant has a synergistic flame retardant mechanism. The combination of the two can expand the temperature range of the flame retardant effect and prolong the time of the flame retardant effect, so as to play a synergistic flame retardant role.

Treatment Technology

When a large amount of inorganic flame retardant is added to the resin, its processing properties and mechanical properties are often affected. Therefore, it is very necessary to modify the traditional inorganic flame retardants.

Treatment technologies that may be involved in inorganic flame retardant include but are not limited to the following:

  • Microencapsulation
  • Surface modification
  • Dust-less or dust-free treatment
  • Synergistic effects

If the product you are interested in is not found in our product list, please contact us to customize a specific flame retardant using professional processing technology.

Research Information

In order to improve the flame retardancy of expandable graphite (EG) in rigid polyurethane foam (RPUF), Yintao Wang et al. used inorganic nanoparticle ATH to wrap EG particles to form composite particles EG@ATH with a core-shell structure. In this work, the enhanced interaction between core-shell particles and the polymer matrix protects the cellular structure of RPUF from damage by EG particles. [1]

Schematic diagram of core-sheSchematic diagram of core-shell expanded graphite@aluminum hydroxide (EG@ATH) flame retardantll expanded graphite@aluminum hydroxide (EG@ATH) flame retardant [1]

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  1. intao Wang, et al. (2017). "Core-shell expandable graphite @ aluminum hydroxide as a flame-retardant for rigid polyurethane foams," Polymer Degradation and Stability 146, 267-276.
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