![]() The chemicals used in these types of retardants are often toxic. Generally, these retardants are organic halides ( haloalkanes) such as Halon and PhostrEx. gas phase) can be interrupted by fire retardants. Reactions in the gas phase: chemical reactions in the flame (i.e.They endothermically decompose releasing both water and carbon dioxide, giving fire retardant properties to the materials in which they are incorporated. Mixtures of huntite and hydromagnesite work in a similar manner. Additionally, the residue of alumina forms a protective layer on the material's surface. This reaction absorbs a great deal of heat, cooling the material into which it is incorporated. ![]() When heated, aluminium hydroxide dehydrates to form aluminum oxide (alumina, Al 2O 3), releasing water vapor in the process. This may dilute the radicals in the flame enough for it to go out.Ĭommonly used fire retardant additives include mixtures of huntite and hydromagnesite, aluminium hydroxide, and magnesium hydroxide.
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