| Item | SN 99.90 | SN 99.95 | SN 99.99 |
| SN% ≥ | 99.9 | 99.95 | 99.99 |
| Como % ≤ | 0.008 | 0.003 | 0.0005 |
| FE % ≤ | 0.007 | 0.004 | 0.002 |
| ≤ % | 0.008 | 0.004 | 0.0005 |
| PB% ≤ | 0.032 | 0.02 | 0.0035 |
| Bi% ≤ | 0.015 | 0.006 | 0.0025 |
| SB% ≤ | 0.02 | 0.014 | 0.0015 |
| CD% ≤ | 0.0008 | 0.0005 | 0.0003 |
| Zn % ≤ | 0.001 | 0.0008 | 0.0003 |
| Al% ≤ | 0.001 | 0.0008 | 0.0005 |
| S% ≤ | 0.0005 | 0.0005 | 0.0003 |
| AG% ≤ | 0.005 | 0.0001 | 0.0001 |
| Ni ≤ Co% | 0.005 | 0.005 | 0.0006 |