Biodiesel Cetane RatingSearch this site! Biodiesel cetane rating is used to rate combustion quality. The number is a measure of the delay of injection time. The higher the number, the shorter the ignition time.• The higher the fuel’s cetane number, the smoother the engine will run, and the fewer emissions are released. • Biodiesel’s oxygen content causes it to have a higher cetane number than petroleum diesel. • Biodiesel must have a cetane number greater than 47 in order to pass ASTM standards. • In comparison, ASTM certified petroleum diesel only needs a cetane number greater than 40.
The greater the cetane rating, the gentler on the engine it is than petroleum diesel!
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