Thermal analysis could be used as a powerful technique to check the purity of the sample. In this paper thermogravimetric analysis (TG) and differential thermal analysis (DTA) have been used to check the purity of fullerene sample prepared by different techniques. Hence it is possible to compare the purity of the samples, too. The analyzed results have been compared and hence correlated with the other characterization techniques, e.g. FAB-Mass, FTIR, UV-VIS and SEM.