Two peaks appeared on DSC solidification curve of a Composite 3 (Fig.1), as a simple signal of inhomogeneous composite or chemical products generated during crystallization process. The re­crystallization of the Composite 3 was made with DSC at a cooling/heating rate of 0.50C/min and temperature range from 150-2200C. Comparable FTIR spectral study was performed on Composite 3 for examination of the possible chemical degradation or chemical interaction (Fig.2).

Relative intensities of the absorption peaks were almost the same for the two samples of salt/eutectics graphite composites Fig.2, (1), (2), but lower as compared to the single NaNO3/KNO3 eutectics (3). Evaluations of the spectra provided with an evidence of a maximum characteristic absorption band at 1379 cm-1, displayed for vibrations of the nitro functional group of NaNO3 and KNO3 compounds. Products of chemical degradation or chemical reaction were not identified from anion frequencies recorded for all samples.