The flame retardants containing bromine or chlorine also decompose when the polymer decomposes to form volatile combustibles. The halogen escapes with the volatile combustibles and acts in the vapor phase to inhibit flaming combustion.

• 在聚合物分解时,含有溴或氯的阻燃剂也会分解成可燃性气体,卤素也与可燃性气体一起释放出,它在气态时会阻止燃烧。