A fuel property that is particularly important for the low temperature operability of biodiesel fuel is the cloud point, defined as the temperature at which crystals are observed to precipitate from the fuel. Therefore, it is an index of the lowest temperature of the fuel’s usability for certain applications. Operating at temperatures below the cloud point of a biodiesel fuel can result in fuel filter clogging due to the wax crystals. Cloud point determination is also useful information for blending purposes. Cloud point analysis is performed in accordance with ASTM D2500.
ASTM D6751 Requirement: None. Report Only.