Flame retardant is a method in which when a plastic containing a flame retardant is exposed to a flame, it can suppress the spread of the flame and prevent the formation of smoke, and the combustion will stop when the flame is removed. The principle of flame retardant used in plastic can be roughly divided into three types:
(1) Reactive type of flame retardant can react with oxygen to form an inert gas, enveloped around the combustion products, and reduce the oxygen content of the combustion products to achieve the purpose of terminating combustion. This method is used for CO, CO2, NH3 and halogen compounds, such as PVC, PU foam, polyester or epoxy resin.
(2) A non-reactive type of flame retardant is a compound containing halogen, phosphorus, nitrogen or boron. When combustion occurs, an inert substance can be decomposed and covered on the surface of the plastic burning object. Form a layer of obstacles to separate the outside oxygen to achieve the purpose of fire resistance.
(3) When a flame retardant containing an aqueous oxide such as alumina is subjected to combustion, water vapor can be released to absorb the hot gas in the combustion process, so that the temperature around the combustion product is lowered to suppress the spread of the flame and prevent the formation of smoke.
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