The most common thermal gravimetric method used in the study of decomposition reactions or interactions of the sample with gases that are in the furnace unit. Therefore, modern thermal gravimetric analysis always includes strict control of air samples using the built-in system analyzer blowing furnace. Thermal gravimetric analysis - a well-established thermo-analytical method, which is an absolute (not requiring pre-calibration) method of analysis, which makes it one of the most accurate methods, along with the classical gravimetric analysis.