ASTM publishes latest changes for B100 spec: ASTM D 6751-07

By | April 06, 2007
American Society for Testing and Materials (ASTM) International recently published ASTM D 6751-07, the new blend stock specification for B100. This new ASTM number and new parameters supersede all other versions of D 6751, including the D 6751-06b that was published in January for only a short time.

D 6751-07 includes the changes made to D 6751-06b: the addition of a three-hour induction period stability test and the use of EN 14538 as the referee method measurement of calcium per milligram and sodium per kilogram. It also features:

--The removal of Footnote A of Table 1, which used to allow the buyer and seller to agree on different limits

--The formal allowance of the option to use the automatic cloud point testing method (D 5773)

--Changing the scope of the standard to make D 6751 a generic blending stock, not just a blending stock for D 975 (i.e., on- or off-road fuel)

The industry desired these changes in order to push forward with the formal acceptance of up to B5 in both D 975 on- and off-road diesel fuel, up to B5 in D 396 home heating fuel, and the proposed B6 to B20 finished fuel standard. These are all at various stages of the ASTM balloting process.

"We are hopeful these blended fuel ballots can get through the rigorous ASTM ballot voting system by the end of 2007," said Steve Howell, chairman of the ASTM Task Force on Biodiesel Standards and the National Biodiesel Board technical director. "However, if it takes more research to get them through the official approval process, we are committed to do whatever is needed for the end result of new blend specifications."
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