Abstract: Chlorinated oils based on unmodified castor oil polyol were prepared by phosphorus pentachloride (PCl5) – chlorination. Six (6) number chlorinated oils were obtained using 10, 20, 30, 40, 50 and 60 wt% concentrations of the chlorinating agent respectively. The oils were characterized by physical and chemical methods, as well as by Fourier transform infra red (FTIR) and gas chromatography – mass spectrometry (GC - MS) techniques. These chloro-derivatives of castor oil (by substitution) were all non-drying oils.