Fire Retardant Coating: Principle of Fire Retardancy

The fire-resistant coating's fire-retardant principle can be generally summarized into the following five points:
　　The fire-resistant coating itself is non-combustible, preventing the protected material from directly contacting oxygen in the air.
　　Fire-retardant coatings have a lower thermal conductivity, which slows down the rate of heat transmission to the base material.
　　Fire-retardant coatings decompose into non-flammable inert gases when heated, diluting the flammable gases released by the protected object upon heating, making it less likely to ignite or slow down the combustion rate.
　　Nitrogen-containing fire-resistant coatings decompose upon heating to release groups such as NO and NH3, which then react with organic free radicals, breaking the chain reaction and reducing temperature.
　　⑸ The expandable fire-retardant coating expands and foams upon heating, forming a carbon foam insulating layer that seals the protected object. It delays the transfer of heat to the base material, preventing the object from catching fire and burning or experiencing a decline in strength due to temperature rise.