| Class | Cu | Cu+Ag | Ag |
| Class 1 | 99.9 min | – | – |
| Class 2 | – | 99.9 min | 0.15 to 0.25 |
| Class 3 | – | 99.9 min | 0.08 to 0.12 |
| Class 4 | – | 99.9 min | 0.06 to 0.10 |
| JIS C 2801:1995 | |||
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