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Fire protection mechanism of fire retardant coatings

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The fire prevention mechanism of fireproof coatings can be roughly summarized into the following five points:

(1) The fireproof coating itself is flame retardant or non-flammable, so that the protected substrate does not directly contact with the air, delaying the ignition of the object and reducing the burning speed.

(2) In addition to its inherent flame retardancy or non-combustibility, fireproof coatings also have a lower thermal conductivity, which can delay the transfer of flame temperature to the substrate to be protected.

(3) The fireproof coating is decomposed into a non-combustible inert gas by heat, which dilutes the combustible gas which is decomposed by the protected object, so that it is not easy to burn or the burning speed is slowed down.

(4) The nitrogen-containing fireproof coating is decomposed by heat to form groups such as NO and NH3, and combines with organic radicals to interrupt the chain reaction and lower the temperature.

(5) The intumescent fireproof coating is thermally expanded and foamed to form a carbon foam insulation layer to seal the protected object, delay the transfer of heat and the substrate, and prevent the object from burning or causing a decrease in strength due to an increase in temperature.

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