Metrological study of typical Brazilian diesel

New alternative energy has been an interesting field for research and development in attempt to diminish the environmental imbalance that has occasioned several climatic changes occurred over the past decades. This research area has obtained a great advance in methodologies to produce alternative energies, where is possible to produce energy through alternative sources that usually are less polluting and are useful to replace the crude oil and petroleum derivatives. These alternative energy sources have become an important tool in the fight against pollution. Among some alternatives energy, stands out biodiesel an available alternative fuel, which is capable to diminish problems related to important areas as environmental and social development. From this point INMETRO, has developing, in line with the policy of the Brazilian government, studies to obtain alternative and renewable sources of energy as bioethanol and biodiesel. This work shows a methyl biodiesel short-time stability study in attempt to observe how much temperature can affect the biodiesel quality. Were used two methodologies to verify the biodiesel quality, the oxidative stability by Rancimat method and Iodine Index.