Ford's answers to the NHTSA 6.7 Investigation

ASTM Biodiesel Standard ASTM D6751 - 11b

D6751-11b Standard Specification for Biodiesel Fuel Blend Stock (B100) for Middle Distillate Fuels



This is the standard that biodiesel B100 is produced to --- and used to blend down to B5 or whatever your state sells locally.


The question: we know they do not test for metabolites from storage and handling.

But what do they test for, corrosion and reactivity wise?

5.1.2 Water and Sediment—

Test Method D2709.

Test
Method
D1796 may also be used. Test Method D2709 shall be the referee method. The precision and bias of these test
methods with biodiesel is not known and is currently under
investigation.

5.1.7 Corrosion—Test Method ASTM D130, 3 h test at 50°C.

Basically soaking a copper strip in it for 3 hrs.

X1.6 Copper Strip Corrosion
X1.6.1 This test serves as a measure of possible difficulties
with copper and brass or bronze parts of the fuel system. The
presence of acids or sulfur-containing compounds can tarnish
the copper strip, thus indicating the possibility for corrosion.

X1.18 Oxidation Stability
X1.18.1 Products of oxidation in biodiesel can take the form
of various acids or polymers, which, if in high enough
concentration, can cause fuel system deposits and lead to ?lter
clogging and fuel system malfunctions. Additives designed to
retard the formation of acids and polymers can signi?cantly
improve the oxidation stability performance of biodiesel. See
Appendix X2 for additional information on long-term storage.
It is recommended that
EN 15751 be utilized for measurement
of biodiesel oxidation stability, because
EN 14112 may be
withdrawn in the future as an option for testing biodiesel and
biodiesel blends.