ASTM Biodiesel Specifications

These tables show selected ASTM requirements for B100 and B6 to B20. Note that the specifications are constantly being updated and modified. It is up to you to ensure you are using the required version of the specification. To learn more about biodiesel, go to the Fuel Basics or Blends pages. The National Biodiesel Accreditation Program takes fuel quality a step further with the BQ9000 program combining ASTM standards and a quality systems program, which includes biodiesel production through end-use.

B100

This table shows selected requirements for B100, 100% biodiesel, as listed in ASTM D6751. The full standard can be purchased from ASTM International.

Requirements for Biodiesel (B100) Blend Stock ASTM D6751
Property Test Method Limits Units
Calcium and magnesium combined EN14538 5 max ppm
Flash point D93 93.0 min °C
Water and sediment D2709 0.050 max vol %
Kinematic viscosity, 40°C D445 1.9-6.0 mm2/s
Sulfated ash D874 0.020 max % mass
Sulfur D5453 0.0015 max (S15)
0.05 max (S500)
% mass
Copper strip corrosion D130 0.020 max -
Cetane number D613 47 min -
Cloud point D2500 Report to customer °C
Carbon residuea D4530 0.050 max % mass
Acid number D664 0.50 max mg KOH/g
Free glycerin D6584 0.020 % mass
Total glycerin D6584 0.240 % mass
Phosphorus content D4951 0.001 max % mass
Distillation temperature, 90% recovered (T90)b D1160 360 max °C
Oxidation stability EN15751 3 min hours
Cold Soak filterability D7501 360 maxc seconds
Alcohol control - One of the following must be met:
(1) Methanol content EN14110 0.2 max vol %
(2) Flash point D93 130 min °C

 a Carbon residue shall be run on the 100% sample.
 b Atmospheric equivalent temperature.
 c B100 intended for blending into diesel fuel that is expected to give satisfactory vehicle performance at fuel temperatures at or below 10°F (-12°C) shall comply with a cold soak filterability limit of 200 s maximum.

B6 to B20

This table shows requirements for 6% biodiesel (B6) to 20% biodiesel (B20) as listed in ASTM D7467. The full standard can be purchased from ASTM International.

Requirements for Biodiesel B6-B20 ASTM D7467
Property Test Method Limits Units
Acid number D664 0.3 max mg KOH/g
Viscosity at 40°C D445 1.9-4.1a mm2/s
Flash point D93 52b °C
Cloud point D2500 Report to customer °C
Distillation temperature, 90% evaporated D86 343 °C
Ramsbottom carbon residue on 10% bottoms D524 0.35 max % mass
Sulfur D5453 0.0015 max (S15)
0.05 max (S500)
% mass
Cetane number D613 40 minc -
Ash content D482 0.01 % mass
Water and sediment D2709 0.050 max % mass
Copper corrosion 3 h at 50°C D130 No. 3 -
Biodiesel content D7371 6-20 % (V/V)
Oxidation stability EN15751 6 min Hours
Lubricity at 60°C D6079 520 maxd micron
One of the following must be met:
(1) Cetane index D976 40 min -
(2) Aromaticity D1319 35 max -

 a If Grade No. 1-D or blends of Grade No. 1-D and Grade No. 2-D diesel fuel are used, the minimum viscosity shall be 1.3 mm2/s.
 b If Grade No. 1-D or blends of Grade No. 1-D and Grade No. 2-D diesel fuel are used, or a cloud point of less than -12°C) is specified, the minimum flash point shall be 38°C.
 c Low ambient temperatures as well as engine operation at high altitudes may require the use of fuels with higher cetane ratings. If the diesel fuel is qualified under Table 1 of D975 for cetane, it is not necessary to measure the cetane number of the blend. This is because the cetane number of the individual blend components will be at least 40, so the resulting blend will also be at least 40 cetane number.
 d If the diesel fuel is qualified under Table 1 of D975 for lubricity, it is not necessary to measure the lubricity of the blend. This is because the lubricity of the individual blend components will be at least 520 microns, so the resulting blend will also be at least 520 microns.