This International Standard specifies a method for estimating the free alcohols content of essential oils, by determination of ester value after acetylation.¹⁾

This method is applicable to essential oils containing an appreciable proportion of tertiary alcohols, namely of linalol and terpineol, ISO/R 1241 not being applicable to those oils.

This method is not applicable to essential oils containing appreciable proportions of phenols, anthranilates, lactones and aldehydes, as stated in ISO/R 1241.