2. Generate free radicals can react with plastic, flame retardant effect. Their reaction with the plastic products of combustion performance is poor.

3. Create a gas to smother the flames. Such as antimony trioxide, it encountered in PVC burning of HCL smothered react when they produce a gas, namely antimony oxide.

4. That, when burned, absorbing heat and cooling slow burn rate. Molecules such as aluminium hydroxide, it contains chemical association water is as high as 34%, the proportion of the association of water in most plastics processing temperature stable, but more than 200 ℃ when began to decompose, releasing water vapor. A mole of aluminum hydroxide and each decomposition, 36 kilocalorie quantity of heat to absorb.