Abstract: Intumescent flame retardants (IFR) had been taken more and more attention for its environmentfriendly, high efficiency, and antidripping behaviors. This paper summarized the composition, flame retardant mechanism, and applications of PNbased and the expansible graphitebased IFR. The approaches to enhance the flame retardant efficiency of IFR were also discussed, including synergistic technology, surface modification, and microencapsulation. In the end, the future development of IFR was forecast.

Key words: intumescent flame retardant, phosphorus containing, flame redardant mechanism