The thermal expansion tensor of the C-60.2S(8) solvate as determined through X-ray measurements in the 90-470 K range is found to be strongly anisotsopic. The intermolecular interactions which account for the weakest thermal expansion direction and which are likely to be the strongest ones are mainly C-60-S-8 interactions. Furthermore, contrary to what is observed for other solvates, C-60.2S(8) resists desolvation through mechanical treatment. It is shown that C60.2S8 local order is maintained in the resulting non-crystalline phase. On heating, this phase reverts to crystalline C-60.2S(8) near the melting temperature of pare sulphur. These results support strong C-60-S-8 interactions.