The present research work analyzes the behavior of aqueous solutions of hexamethylenetetramine, determining several physical properties such as density, speed of sound, viscosity, and surface tension. Besides the importance of these properties, they allow the type of interactions between solute and solvent molecules to be analyzed. The study consisted of the evaluation of the influence of amine concentration and temperature upon these properties. An increase in amine concentration causes an increase in density, viscosity, and speed of sound and a decrease in isentropic compressibility and surface tension. On the basis of experimental data of isentropic compressibility and surface tension the presence of temperature resistant structure has been determined.