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The biodiesel, containing methyl esters, became one of the potential subtitute to diesel fuel. It has many advantages such as a renewable, biodegradable and non-toxic fuel. The biodiesel could be obtained from triglycerides of animal fats or vegetable oils by transesterification and FFA (free fatty acids) by esterification reaction in the existence of base and acid materials as catalyst. However, the use of these feedstocks increased the price of production. Therefore, the low-quality oils such as used frying oils has been recently considered as the most potential raw material for the production of biodiesel in previous years [1-4]. Usually, the methyl ester from non-edible oils could be produced by chemical method of homogeneous catalyst [5,6]. However, several disadvantages related to homogeneous catalysts such as non-separatibility, non-reusability and corrosiveness that create new matters to the environment. Moreover, the use of this catalyst in the reaction to produce biodiesel requires additional step for the neutralization, which generates additional costs [7]. Therefore, the use of homogeneous catalyst for biodiesel production became unfavourable. The heterogeneous catalyst system could be an attractive solution to solve these disadvantages because the heterogeneous catalyst could be easily separable, reusable and inexpensive [8-10]. There Synthesis and Catalytic Activity of Magnesium Hydroxide Fluorides for Production of Biodiesel: Influence of Different Mg/F Ratios