Historical
ISO 658:1988
Oilseeds -- Determination of impurities content
The method consists in separating of the impurities, by sieving and sorting, into three categories as follows: -fines, -non-oleaginous impurities, - oleaginous impurities, followed by determing of the mass of total impurities or, on request, of the mass of each category of impurity.
International Organization for Standardization [iso]