ISO 5890:1981 Preview
Manganese ores and concentrates -- Determination of silicon content -- Gravimetric method
The method is applicable to products having a silicon content greater than 0,5 % (m/m) and a fluorine content not more than 0,1 % (m/m). Should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, procedure and expression of results.