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Fire-retardant materials are designed to burn slowly.. Fire-retardant materials should not be confused with fire-resistant materials. A fire resistant material is one which is designed to resist burning and withstand heat.
These intumescent materials produce a light char which is a poor conductor of heat, thus retarding heat transfer. Typically the light char consists of microporous carbonaceous foam formed by a chemical reaction of three main components: ammonium polyphosphate , pentaerythritol , and melamine . [ 2 ]
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. Commonly used fire retardant additives include mixtures of huntite (Mg 3 Ca(CO 3) 4) and hydromagnesite (Mg 5 (CO 3) 4 (OH) 2 ·4H 2 O), aluminium hydroxide (Al(OH) 3), and magnesium hydroxide (Mg(OH ...
Intumescent fireproofing is a layer of a material which is applied like paint on the structural steel members. The thickness of this intumescent coating is dependent on the steel section used. Intumescent coatings are applied in a relatively low thickness (usually 350- to 700- micrometer ), have a more aesthetic smooth finish, and help prevent ...
A way to stop spreading of the flame over the material is to create a thermal insulation barrier between the burning and unburned parts. [14] Intumescent additives are often employed; their role is to turn the polymer surface into a char, which separates the flame from the material and slows the heat transfer to the unburned fuel. Non ...
Dry chemical powder is used on all classes of fires. Dry chemical powder puts out the fire by coating the burning material with a thin layer of dust, thereby separating the fuel from the oxygen in the air. The powder also works to interrupt the chemical reaction of fire, so these extinguishers are extremely effective at putting out the fire.