In this work, Inverse Gas Chromatography(IGC) at finite concentration is employed for the study of the interaction characteristics of poly(dimethylsiloxane) (PDMS) with various solvents such as water, ethanol, and iso-propanol. By measuring the specific retention volumes of the probes, the interaction parameters are calculated using the Flory-Huggins equation. From the results, The interaction parameters of the probes are, as expected due to the hydrophobicity of the polymer, found to be of large positive values(2-3 mol/g according to the Flory-Rehner equation.