The popularity of biodiesel as an alternative fuel has grown recently as a result of environmental awareness and worries about the quick depletion of fossil resources. However, the degradation behaviour of an elastomer and polymer tends to expose during storing period of mixed biodiesel. As a result, the aim of this research is to see how palm oil biodiesel (POB) affects the elastomeric/polymeric materials as a storage tank. A static immersion tests were done in B10 (10% of biodiesel and 90% of diesel), B30 (30% of biodiesel and 70% of diesel) and B100 (pure biodiesel) at two different temperatures which is, room temperature (27℃) and 50℃ for 6 weeks. The mass (ASTM D741) and tensile (ASTM D638) standard tests were followed to determine the compatibility of high-density polyethylene (HDPE) exposed to POB as a storage tank. Before the immersion started, the initial mass of the sample, M0 was determined. After 6 weeks of immersion, the mass of HDPE increasing gradually while the tensile strength is slightly decrease for both temperature and concentrations. This phenomenon might be caused by the absorption of biodiesel into the HDPE and caused the ductility of the material increase.

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