Principle of action of fire retardant coatings
2025-08-15
Fire retardant coating is a special coating used on the surface of flammable substrates or building components. Its core function is to reduce the flammability of materials, retard flame spread, and improve the fire resistance limit of coated substrates. Its fire prevention principle mainly includes the following five points:
Flame retardancy: the coating itself is difficult to burn or non-flammable, so that the substrate is isolated from the air and delayed ignition.
Low thermal conductivity: The coating has a low thermal conductivity and slows down the conduction of flame temperature to the substrate.
Inert gas dilution: Inflammable inert gas is decomposed by heating, which dilutes the combustible gas decomposed by the substrate.
Intumescent foaming: Intumescent coating expands when heated to form a carbonaceous foam layer that insulates oxygen and heat.
Chemical interruption: Nitrogen-containing coatings decompose NO, NH and other groups, interrupting the combustion chain reaction.
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