Fire Retardant, Physical Action
Fire Retardant, Physical Action : There are several ways in which the combustion process can be retarded by physical action. (1) By cooling, some chemical reactions actually cool the material down. (2) By forming a protective layer that prevents the underlying material from igniting. (3) By dilution, some retardants release water and/or carbon dioxide while burning. This may dilute the radicals in the flame enough for it to go out. One commonly used fire retardant coating is aluminium hydroxide. When heated, it dehydrates to form aluminum oxide (alumina, Al2O3), releasing water vapor in the process. This reaction absorbs a great deal of heat, cooling the material over which it is coated. Additionally, the residue of alumina forms a protective layer on the material's surface
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