Item

       Index

Super class

First class

Qualified class

Purity                                                        ≥%

99.5

99.0

98.0

Moisture                                                  ≤%

0.30

0.50

0.80

Water insolubles                                   ≤%

0.01

0.03

0.03

Chloride (based on Cl)                        ≤%

0.15

0.20

0.30

Sulfate (based on SO4)                       ≤%

0.01

0.02

0.02

Chromate (based on CrO4)               ≤%

0.01

0.02

0.02

Fe (based on Fe)                                  ≤%

0.005

0.03

0.05