The polymer industry developed as population growth created, increased demands for natural products that could not readily be met because of their limited supplies. The explosion of knowledge about polymers and the application of that knowledge to technology have occurred in the areas of both synthetic and naturally occurring polymer. The aim of this study was to find out the influence of different types of stabilizers; UV-Absorber, Carbon Black, and Titanium Dioxide, on the photo and thermal degradation mechanism of two different grades of polyethylene.