Items |
Best Quality ( Ion-membrane Process) |
First Quality (Diaphragm Elec-Process) |
Sodium Hydroxide %≥ |
99.5 |
96.0 |
Sodium Carbonate%≤ |
0.5 |
0.8 |
Sodium Chloride %≤ |
0.05 |
0.05 |
Ferroso-ferric Oxide %≤ |
0.004 |
0.005 |
Silicon Dioxide %≤ |
0.004 |
0.006 |
Sodium Sulfate %≤ |
0.050 |
0.070 |
Copper %≤ |
0.0002 |
0.0005 |
Calcium %≤ |
0.005 |
0.008 |