Diesel Fuel Standards & Tests
following are the five performance properties that comprise the
National Conference on Weights and Measures (NCWM)
Premium Diesel Fuel Standards. As of 2004, a Fuel marketer must meet all
of these standards in order to be able to advertise a fuel as "Premium
Diesel" in states that adopt the
Energy (Btu) Content:
The fuel must have at least 138,700 Btu, as
measured by ASTM D-240
The fuel must have a Cetane number of at
least 47, as measured by ASTM D-613.
A maximum wear scar
diameter of 520 microns as determined by ASTM D 6079. If an enforcement
jurisdiction?s single test of more than 560 microns is determined, a second
test shall be conducted. If the average of the two tests is more than 560
microns, the sample does not conform to the requirements of this part.
Low Temperature Operability:
A cold flow performance
measurement which meets the ASTM D 975 tenth percentile minimum ambient air
temperature charts and maps by either ASTM Standard
Test Method D 2500 (Cloud
Point) or ASTM Standard Test Method D 4539 (Low Temperature Flow Test, LTFT).
Low temperature operability is only applicable October 1 ‑ March 31 of each
The fuel must get at least an 80% reflectance
as determined by
ASTM Standard Test
Method D 6468 (180 minutes, 150°C).