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 How are tin ingots classified by chemical grade?

1. 1.
   ​​Industrial Grade​​
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     Purity: 99.85%-99.90%
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     Applications: Solder, tinplate, alloys
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     Max impurities: Pb ≤ 0.05%
2. 2.
   ​​High Purity Grade​​
   • •
     Purity: 99.90%-99.95%
   • •
     Applications: Electronics, chemicals
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     Pb ≤ 0.01%, special impurity control
3. 3.
   ​​Ultra-High Purity Grade​​
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     Purity: 99.99%+
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     Applications: Semiconductors, optics
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     Oxygen ≤ 5ppm, trace metal control
4. 4.
   ​​Specialty Grades​​
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     Oxygen-free tin (for brazing)
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     Doped tin (for specific alloys)
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     Certified conflict-free tin

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  ICP-MS for trace elements
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  Glow discharge mass spectrometry (GDMS)
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  Wet chemistry analysis
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