The thermal behaviour of the composites was investigated during TG-DTA experiments in the inert atmosphere of argon. The recorded ΤGA thermograms (Figure ) indicate that the materials have relatively high thermal stability, as their maximum decomposition step occurs at temperatures ranging between 394 °C and 402 °C. The main mass loss step (78-99 wt%) was observed in the temperature range of 260-485 °C, and the high temperature decomposition takes place above 485 °C with a mass loss of about 1 wt%. The course of the DTG curves (Figure ) suggests that simultaneous processes occur during heating of the material, and therefore a weak signal can be observed around 448 °C.