The stearic acid-urea binary system exhibits an unusual phase diagram, which, on the one hand, indicates an incongruently
melting inclusion compound and on the other hand a miscibility gap in the liquid phases. The peritectic point lies near the
melting point of urea and the unstable congruent melting point of the inclusion compound coincides with the melting point
of urea. In addition to the processing of the phase diagram, the pure inclusion compound was prepared and its DSC curve, FTIR
spectrum and X-ray diffractogram were recorded.