The optimum mix proportion between the paraffin and EVM-800 was firstly determined. Four paraffin/EVM-800 mixtures were prepared at paraffin-to-EVM- 800 weight ratios of 0.4:1.0, 0.6:1.0, 0.8:1.0 and 1.0:1.0, by using the experimental setup shown in Fig. 2. Paraffin leakage from these prepared mixtures were tested, following the previously documented method [25].