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 What are the key quality standards governing tin ingot production?

1. 1.
   ​​ISO 21638:2020​​ - Primary standard specifying:
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     Chemical composition limits
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     Mechanical properties
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     Testing methodologies
2. 2.
   ​​ASTM B339​​ - American standard detailing:
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     Purity grades (Grade A ≥99.90%)
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     Dimensional tolerances
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     Sampling procedures
3. 3.
   ​​GB/T 728-2010​​ - Chinese national standard with:
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     Sn content ≥99.90% requirement
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     Specific impurity controls for domestic markets
4. 4.
   ​​LME (London Metal Exchange) Specifications:​​
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     Minimum 99.85% Sn purity
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     Registered brand requirements
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     Delivery lot specifications

• •
  ​​Chemical:​​ Sn purity, heavy metals (Pb, As, Sb, Bi)
• •
  ​​Physical:​​ Density, hardness, corrosion resistance
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  ​​Metallurgical:​​ Grain structure, inclusion content
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  ​​Documentation:​​ Certificate of Analysis (CoA) and Traceability