One, to provide a layer of coating with oxygen isolation, such as phosphate ester flame retardant combustion generated when the phosphide is oxygen insulation coating.

Second, generates free radicals can react with plastic, flame retardant effect, their reaction products with plastic combustion performance is poor.

Three, absorb heat during burning, cooling slow burn rate effect, such as aluminum hydroxide, its molecular chemical association of water contained in proportion is as high as 34%, the association of water in most plastics processing temperature stable, but more than 200 ℃ when starts to break down, releasing water vapor, break up a molar aluminum hydroxide, and every 36 kilocalorie quantity of heat to absorb

Smothered four, can produce a kind of gas flame, such as antimony trioxide, it encountered in PVC because of the burning issue of HCL smothered react when they produce a gas, namely antimony oxide.

Behind the plastics flame retardants is not so simple, just fire retardant in addition, will also produce more than many substances, eventually achieve the goal of prevent burning plastic.