Biodiesel Fuel Testing. ASTM D6751-11b Testing requirements

Modified on: Tue, 30 Apr, 2019 at 1:09 PM

Testing requirements for ASTM D6751-11b and the rationale for each analysis.


Test Method

Indicator Of

Possible Field Problems

Acid Number
D664Unreactive acids, oxidized fuelCorrosion, clogged filters
Calcium & MagnesiumEN14538Processing problemsFilter plugging & engine deposits
Carbon ResidueD4530Carbon deposition, adulterationExcessive smoking, increased particulates
Cetane NumberD613Ignition qualityPoor engine performance, engine knock
Cloud PointD2500Crystal formationFuel filter plugging, lack of cold weather operability
Cold Soak FilterabilityD7501Feedstock type / processing issuesFilter plugging
Copper Strip CorrosionD130Unreacted acidsCorrosion of copper, brass & bronze fuel system parts
Distillation TemperatureD1160Impurities or adulterationPoor engine performance
Flash PointD93Unreacted AlcoholFire risk during handling & storage
Free Glycerin / Total GlycerinD6584Unreacted or partially reacted oil or fatInjector deposits, plugged filters
Kinematic Viscosity 40CD445Adulterants, oxidationPoor engine performance, plugged fuel filters or fuel system
Methanol ContentEN14110Unreacted alcoholFire risk during handling and storage
Oxidation StabilityEN15751Overall product qualityFuel system deposits, filter plugging
Phosphorus ContentD4951Contaminated feedstockDamaged or malfunctioning catalytic converters
Sodium & PotassiumEN14538Processing problemsFilter plugging and engine deposits
Sulfated AshD874Presence of abrasive solids, unremoved catalystInjector, fuel pump, piston and ring wear, filter plugging and engine deposits
SulphurD5453High sulphur feedstock, adulterantEngine wear, increased emissions
Water and SedimentD2709Workmanship / over all production qualityPoor engine performance, fuel filter plugging.

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