This International Standard specifies a method for the determination of the fat content of butter, edible oil emulsions (2.2) and spreadable fats (margarine, vegetable oil spreads, dairy spreads and blended spreads).
GSO ISO 17189:2014 history
2014GSO ISO 17189:2014 Butter, edible oil emulsions and spreadable fats -- Determination of fat content (Reference method)