The purpose of this research is to study the mechanical strengths and physical changes of the biopolymer (BP) and biopolymer composite (BPC) after exposed to UV irradiation. Virgin vegetables oil (VO) and Waste vegetables oil (WO) has been treated with chemical process and mixed with Methylene Diphenyl Diisocyanate (MDI) to produces BP. BPC samples were doped with 2.5, 5, 7.5 and 10 % metal oxide, Titanium Dioxide (TiO₂). These samples were exposed using UV weatherometer at 0, 250, 500, 750, 1000, 2000, and 3000 hours. The effects of UV light on the mechanical properties of BP and BPC were determined by tensile test. The colour changes of BP and BPC were observed after expose to UV light.