The American Society for Testing and Materials (A.S.T.M.) have established a standard D4806-98 for "Denatured fuel ethanol for blending with gasoline, for use as automotive spark-ignition engine fuel", which is generally accepted throughout the industry. For full details and test procedures, reference should be made to the standard, which is available from A.S.T.M.
|1.||Ethanol, %v/v:||92.1 min.|
|2.||Methanol, %v/v:||0.5 max. (5,000 ppm)|
|3.||Water, % v/v:||
1.0 max. (10,000 ppm)
|4||Solvent-washed gum, mg/100ml:||
5 max. (50 ppm)
|5.||Chloride ion, mg/L:||
40 max. (40 ppm)
|6.||Copper content, mg/kg:||
0.1 max. (0.1 ppm)
|7.||Acidity, as acetic acid, %w/w: *||
0.007 max. (70 ppm)
|8.||Appearance:||Visibly free of suspended or precipitated contaminants (clear and bright).|
A minimum of 1.96% v/v, and a maximum of 4.76% v/v of natural gasoline, gasoline components or unleaded gasoline.
* Note: There was an error in the original standard. It stated "mass % (mg/Litre)" which are not the same units, whereas the relevant analytical method specifies "%w/w."