scope:

This CEN Workshop Agreement specifies requirements and test methods for marketed and delivered
emulsion fuel. It is applicable to emulsion fuel for use in internal combustion engine vehicles designed to run on diesel as specified in EN 590.
NOTE 1 Deliverance to public fuelling stations is currently not envisaged.
Emulsion fuel is a mixture of 5 % (m/m) to 15 % (m/m) water, diesel and additives to allow use in internal combustion engines, including the possibility of having different 'seasonal grades' for national and local requirements.
NOTE 2 For the purposes of this CEN Workshop Agreement, the terms "% (m/m)" and "% (V/V)" are used to represent respectively the mass fraction and the volume fraction.
Two grades of emulsion fuel are introduced, that differentiate for the amount of water and other related parameters (density, viscosity, stability). The higher water content emulsions (Grade A) provide the best environmental benefits, while the lower water content emulsions (Grade B) will provide less power loss, thus enabling applications where power loss is a critical issue.
NOTE 3 Public availability at retail sites of emulsion fuels, other than with specific local exemption rules, may not be allowed according to national legislation implementing European Community Directives for diesel fuels [1].