Water-diesel emulsions which comply with the following specification were eligible for a reduced excise duty rate in France.

Table 1
Water-Diesel Fuel Emulsion Specification
Fuel Property Unit Limit Test
Min Max
Density @15°C kg/m3 835 870 NF M 07-096
Water content % m/m 9.0 15.0 NF M 07-104
Stability, by centrifuge   NF M 07-101
- phase separation (after 5 min) % v/v - 9.0
- (% sediment after 15 min - % sediment after 5 min) / 10 % v/v/min 0.3 -
Viscosity @40°C mm2/s 2.5 7.0 NF M 07-097
Sulfur mg/kg - * NF M 07-100
Copper corrosion, 3h @50°C   Class 1   NF M 07-098
Flash Point (Cleveland) °C 70 - NF M 07-102
Lubricity (corrected wear scar diameter, wsd 1.4 @60°C) µm - 460 NF M 07-103
CFPP† °C - W: -15
S: 0
NF M 07-099
* Sulfur = S (100 - y) / 100, where S - sulfur (mg/kg) in EN 590 conforming diesel fuel, y (% m/m) water content of the emulsion
† Antifreeze additives are allowed for winter grade, provided the total water content is unchanged