Magnesium hydroxide functions in the same manner as alumina trihydrate

However, while ATH is an effective flame retardant and smoke suppressant for many polyolefins, there are limitations to its use.

Applications include: TPO roofing · plastics · paints/coatings · and many more!



Magnesium hydroxide undergoes endothermic decomposition with water release at 630o F (332o C). The endothermic decomposition of Mg (OH)2 which occurs during combustion is its flame retardant mechanism. For combustion to occur, there must be fuel, oxygen and heat. By absorbing some of the heat, magnesium hydroxide prevents or delays ignition and retards combustion of the polymeric material. The water released during decomposition has the effect of diluting the combustible gases and acting as a barrier, preventing oxygen from supporting the flame.

Mg(OH)2-----------------MgO+H2O

The smoke suppression properties of magnesium hydroxide are believed to be due to the dilution effect of the water vapor on the combustible gases or due to a char formation effect on the polymer.






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Sam Xu 许彪
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