Biodiesel Definition and Specification

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Biodiesel is defined as a fuel that is comprised of mono-alkyl esters of long-chain fatty acids derived from vegetable oils or animal fats and that conforms to ASTM standard D6751. All fuel consisting of at least 99% biodiesel (B99) that is sold or offered for sale must conform to ASTM standard D6751. (Reference 815 Illinois Compiled Statutes 370/4)