Constituent | Al | Cd | Cr | Cu | Fe | Mn | Ni | Pb | Zn |
Long-term use | 5 | 0.01 | 0.1 | 0.2 | 5 | 0.2 | 0.2 | 5 | 2 |
Short-term use | 20 | 0.05 | 1 | 5 | 20 | 10 | 2 | 10 | 10 |