Abstract: Performance and flame-retardant mechanism of magnesium hydroxide were introduced, its synergistic effect with other flame retardants was discussed. It was found that the composites containing magnesium hydroxide generally possessed better flame retarding property through its synergistic effect with other flame retardants. Finally, the trend of the development of magnesium hydroxide based synergistic flame retardants was explored.

Key words: Composite material, Synergistic effect, Flame retardant, Magnesium hydroxide