Item
|
High-Class
|
First-Class
|
Qualified-Class
|
Purity
|
99.3% min
|
99.0% min
|
98.5% min
|
Moisture
|
0.05% max
|
0.10% max
|
0.5% max
|
Calcium (Ca )
|
0.05% max
|
0.10% max
|
0.5% max
|
Iron (Fe)
|
0.005% max
|
0.001% max
|
0.05% max
|
Barium (Ba )
|
0.05% max
|
0.1% max
|
0.5% max
|
Water insolubles
|
0.1% max
|
0.2% max
|
0.5% max
|
Sodium ( Na )
|
0.1% max
|
0.2% max
|
0.5% max
|