90.93 Standard confirmed Mar 25, 2022
ISO
ISO/TC 132 Ferroalloys
International Standard
73.060.20 Manganese ores
Published
Method A is applicable to products having a total iron content from 1 to 25 % (m/m), and method B is applicable to products having a total iron content from 0.2 to 2 % (m/m). ISO 7990 should be read in conjunction with ISO 4297. Specifies principle, reactions (method A only), reagents, apparatus, sampling and samples, procedure and expression of results.
WITHDRAWN
ISO/R 313:1963
PUBLISHED
ISO 7990:1985
90.93
Standard confirmed
Mar 25, 2022
ABANDON
ISO/WD 7990