Tin ingots are divided into three grades according to their chemical composition: Sn99.90, Sn99.95, and Sn99.99. | ||
 The chemical composition of the tin ingot should meet the requirements of the following table. |
Brand | Sn is not less than | chemical composition % | |||||||||
Impurity content is not greater than | |||||||||||
As | Fe | Cu | Pb | Bi | Sb | Cd | Zn | Al | sum | ||
Sn99.90 | 99.90 | 0.008 | 0.007 | 0.008 | 0.040 | 0.015 | 0.020 | 0.0008 | 0.001 | 0.001 | 0.10 |
Sn99.95 | 99.95 | 0.003 | 0.004 | 0.004 | 0.010 | 0.006 | 0.014 | 0.0005 | 0.0008 | 0.0008 | 0.050 |
Sn99.99 | 99.99 | 0.0005 | 0.0025 | 0.0005 | 0.0035 | 0.0025 | 0.002 | 0.0003 | 0.0005 | 0.0005 | 0.010 |
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