What are the requirements for magnesium hydroxide as a flame retardant?

What are the requirements for magnesium hydroxide as a flame retardant?Common flame retardants used to prevent or reduce fuel combustion possibility of a kind of additives, with the development of flame retardants and the strengthening of awareness of fire prevention, the flame retardant flame retardant effect to the time requirements of flame retardant and smoke suppression and development to the present also require no poison, flame retardant system with flame retardant manufacturers now have an idea of magnesium hydroxide as fire retardant has conditions.

1. With high purity, the water loss rate of calcination shall not be less than 30%(it can be calcined at 600 degrees in a high temperature furnace);

2. Hexagonal flake or needle-like microstructure (observed under microscope);

3. It has a relatively fine particle size (above 5000 mesh) and the laser particle size distribution is even, because the particle size is more likely to become the stress concentration point in the composite material, which becomes the weak link of the material;

4. Conduct sufficient surface modification to make it oil-loving and hydrophobic (it can be tested by stirring in water).