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    Magnesium Hydroxide - Flame Retardant Mechanism

    Magnesium hydroxide decomposes when heated (340-490 degrees) to absorb heat from the surface of the combustion product to flame retardant
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    2018-12-21 09:33:32

Magnesium hydroxide decomposes when heated (340-490 degrees) to absorb heat from the surface of the combustion product to flame retardant; at the same time, it releases a large amount of water to dilute the oxygen on the surface of the fuel, and the activated magnesium oxide decomposed to adhere to the surface of the combustible material further prevents The burning is going on. Magnesium hydroxide not only does not produce any harmful substances in the whole flame retardant process, but also its decomposed products can absorb a large amount of harmful gases and fumes generated by the combustion of polymers such as rubber and plastics, and the active magnesium oxide is continuously absorbed. The incompletely burned molten residue is an emerging environmentally friendly inorganic flame retardant that eliminates smoke and prevents droplets while allowing combustion to stop quickly.

Magnesium Hydroxide - Flame Retardant Mechanism

Flame retardants can be divided into organic flame retardants and inorganic flame retardants according to their chemical composition. Organic flame retardants are further divided into two series of phosphorus and halogen. Due to the shortcomings of the organic flame retardant, such as high toxicity and large smoke, the decomposition products are gradually replaced by inorganic flame retardants.

The main inorganic flame retardants are aluminum hydroxide, magnesium hydroxide, red phosphorus, antimony oxide, tin oxide, molybdenum oxide, ammonium molybdate, zinc borate, etc. Among them, aluminum hydroxide and magnesium hydroxide have large heat absorption due to decomposition. And the production of H2O can act as a barrier to air, and the oxide is a high temperature resistant substance after decomposition, so the two flame retardants can not only play a flame retarding effect, but also can play a filling role, and it has no corrosive property. Halogen and harmful gases, non-volatile, long-lasting, non-toxic, smoke-free, non-drip and so on.

Magnesium Hydroxide - Flame Retardant Mechanism


At present, domestic aluminum hydroxide is used in a large amount, but as the processing temperature of the polymer increases, the aluminum hydroxide is easily decomposed and the flame retarding effect is lowered. Magnesium hydroxide has the following advantages over aluminum hydroxide:

1. The thermal decomposition temperature of magnesium hydroxide reaches 340 ° C, which is 100 ° C higher than that of aluminum hydroxide, which is beneficial to the improvement of plastic processing temperature, speeding up extrusion, increasing plasticizing effect, shortening molding time, and high gloss on the surface of the product. Surface defects are produced and, at the same time, a strong peel strength is guaranteed.

2. The particle size distribution is uniform, the compatibility with the substrate is good, and the mechanical properties of the product are small.

3. Magnesium oxide produced by the combustion of magnesium hydroxide is a kind of high-strength and high-heat-resistant material. It can be used as a protective wall to isolate fire source and toxic and harmful gases. The neutralization ability of magnesium hydroxide and acid is strong. The acid gas SO2, NOx, CO2, etc. generated by the plastic combustion process is neutralized relatively quickly.

4. Magnesium hydroxide has high decomposition ability, high flame retardant efficiency, strong smoke suppression ability, low hardness, and low friction to equipment, which helps to extend equipment life.

5, the price is low, magnesium hydroxide is half of the price of aluminum hydroxide, the filling amount is large, which can greatly reduce the cost of the product.


Fengcheng City Heqi Brucite Mining Co., Ltd., is an imports and exports mining company registered in 1998 in Fengcheng City of Liaoning Province. the company is located in Fengcheng City, Primarily engaged in processing minerals. The company property mainly manufactures magnesium hydroxide flame retardant and brucite powder. The export work is handling by DALIAN HEXIN NEW MATERIAL TECHNOLOGY CO., LTD.

Magnesium Hydroxide - Flame Retardant Mechanism


Our annual output amount is up to 100,000 tons. Quality,Integrity, Innovation are our business ideas. Relying on quality products, good services, our company possess good reputation in the line.


"Business Integrity, Standardize Services, Sustainable development, Dedicated to Community" is the company’s Principles. During several years developing, the company possesses own mines and processing plants,It consists of the heqi brucite mine in Fengcheng city (reserves 3,000,000 tons, annual output is 100,000 tons). 


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