Thermo analytical methods play a significant role in the characterization of polymers and related composite materials. Methods include characterization of polymers through simultaneous TG-DTA, DTG and DSC and thermal data are used to evaluate the non isothermal kinetics and thermo dynamics of the solid state decomposition of polymers and related composite materials used non isothermal kinetics. The present review highlights recent developments in the thermal characterization of common thermoplastics, thermosetting polymers, resins, copolymers and polymer composites.