Home > Knowledge > Content

The principle of flame retardant (1)

Jan 14, 2020

1. The suffocation effect of incombustible gas

The flame retardant will decompose non-combustible gas when heated, and dilute the concentration of combustible gas decomposed by combustible materials to the lower combustion limit. It will also dilute the oxygen concentration in the combustion range, successfully hindering the spread of fire.


2. Endothermic effect

The heat released by any combustion in a shorter time is limited. If a part of the heat released by the fire source can be absorbed in a shorter time, the flame temperature will decrease, radiating to the combustion surface and acting on the The heat of the cracking of combustible molecules into free radicals will be reduced, and the combustion reaction will be suppressed to a certain extent. Under high temperature conditions, the flame retardant has a strong endothermic reaction, absorbs part of the heat emitted by the combustion, reduces the temperature of the surface of the combustibles, effectively suppresses the generation of combustible gases, and prevents the spread of combustion. The flame retardant mechanism of Al (OH) 3 flame retardant is to increase the heat capacity of the polymer so that it can absorb more heat before reaching the thermal decomposition temperature.