A series of non-isothermal experiments were conducted for TGA and differential thermal analysis (DTG) using a simultaneous TGA–DTA thermogravimetric analyzer (model Mettler Toledo, TGA/SDTA851, USA). Approximately 10 mg of air-dried EFB powder was placed in an alumina crucible, placed inside a furnace and programmed for continuous heating from room temperature to 1000 °C at predetermined heating rates of 10, 20, and 30 °C/min under airflow at 100 mL/min. The data were recorded by a data logging system, which provided listings of sample weights and temperatures with time. Indium was used to calibrate the temperature reading and the instrument was weight calibrated according to the manufacturer’s instructions.