Liquid petroleum products. Middle distillates and fatty acid methyl ester (FAME) fuels and blend. Determination of oxidation stability by rapid small scale oxidation test (RSSOT)
1 Scope
This document specifies a method for the determination of the oxidation stability
of middle distillate fuels, fatty acid methyl ester (FAME) fuel and blends thereof,
under accelerated conditions, by measuring the induction period to the specified breakpoint in a reaction vessel charged with the sample and oxygen at 140 °C.
NOTE 1 For the purposes of this document, the term “% ( V / V )” is used to represent the volume fraction ( φ ).
NOTE 2 The induction period is used as an indication for the resistance of middle distillates, fatty acid methyl
ester (FAME) fuels and blends thereof against oxidation. This correlation can vary
markedly under different conditions with different FAMEs and diesel fuel blends.
NOTE 3 The presence of ignition improvers can lead to lower oxidation stability results determined
by this method. It has for instance been observed that the addition of 2-ethyl hexyl
nitrate (2-EHN) can reduce the measured oxidation stability values. See [6] for details.
NOTE 4 For further information on the precision data at a test temperature of 120 °C see
Annex C.