NF EN ISO 3657, T60-206 (07/2023)

This document specifies a method for determining the saponification index of fatty substances of animal and vegetable origin. The saponification index is a characteristic of free and esterified fatty acids present in fatty substances and fatty acids. The method is applicable to refined and raw fatty substances of plant and animal origin. In the presence of mineral acids, the results given by this method are no longer interpretable if the mineral acidity is not measured separately. The saponification index can also be calculated from fatty acid composition data obtained by gas chromatography, according to Annex B. To carry out this calculation, it is necessary to ensure that the sample does not contain any significant impurity and that it is not thermally degraded.
(Automatic translation from French)