Dynamic and static mechanical behaviors of polybenzoate/glass fiber/polytetraluoroethylene (POB/GF/PTFE) sealing composites at high temperature were investigated using Dynamic Mechanical Analysis (DMA).Effects of weight content of POB and GF on the storage modulus,thermal transition temperature and creep behavior were explored.The results show that the addition of POB and GF can effectively improve the storage modulus and thermal transition temperature.With the increasing weight content of POB from 0 to 30%,the compression and recovery ratio of the blends are declined,and creep resistance is first decreased,then increased,and finally decreased.The compression and recovery ratio of the blends are first decreased,then increased,and finally decreased with the increasing weight content of GF in the 20%POB/PTFE composite