Vacuum distillation in accordance with ASTM D1160 is used to determine the boiling range characteristics of a hydrocarbon sample. The boiling characteristics have an important effect on the performance, storage, and safety of the fuel. Biodiesel is produced from oils with fatty acid chains that are mostly straight-chain hydrocarbons containing 16 to 18 carbons. Because biodiesel is relatively homogenous and not composed of hydrocarbon fractions with various volatility properties, biodiesel is characterized by a boiling point rather than a boiling range distribution (i.e., distillation curve).
ASTM D6751 Requirement: 90% distilled at a maximum temperature of 360˚C, Atmospheric Equivalent Temperature (AET).