Due to the depletion of fossil fuels, decrease of the conventional oil reserves,
environmental and economic concerns, bio-fuels have gathered a significant attention
as alternative fuels for the future. Their applications in automobiles, industrial gas
turbines and aviation are increasing day by day. This article will discuss bio-diesels and
will provide an overview of their physical properties and compositions, which play an
important role in their injection, atomization, combustion performance and emissions.
Furthermore, it will be judicious to mention the conformity of bio-diesels and their
blends with the standards and regulations. Consequently, the purpose of this study will
be to reveal the acceptance criteria imposed by the standards in order to determine
which bio-diesels will be the most adequate.